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Bael-3842 - How to Pass a Variable From One Thread Group to Another in JMeter (#18687)
* first draft * renaming to avoid errors with RetrieveUuidControllerUnitTest
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‎testing-modules/jmeter-2/src/main/java/com/baeldung/sharedthreadvars/SharedThreadVarsApplication.java

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package com.baeldung.sharedthreadvars;
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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@SpringBootApplication
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public class SharedThreadVarsApplication {
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public static void main(String[] args) {
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SpringApplication.run(SharedThreadVarsApplication.class, args);
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}
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}

‎testing-modules/jmeter-2/src/main/java/com/baeldung/sharedthreadvars/config/SecurityConfiguration.java

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package com.baeldung.sharedthreadvars.config;
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import org.springframework.context.annotation.Bean;
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import org.springframework.context.annotation.Configuration;
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import org.springframework.security.config.annotation.web.builders.HttpSecurity;
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import org.springframework.security.config.annotation.web.configurers.CsrfConfigurer;
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import org.springframework.security.web.SecurityFilterChain;
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@Configuration
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public class SecurityConfiguration {
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@Bean
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public SecurityFilterChain configure(HttpSecurity http) throws Exception {
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http.csrf(CsrfConfigurer::disable)
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.authorizeHttpRequests(auth -> auth.anyRequest()
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.permitAll());
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return http.build();
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}
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}

‎testing-modules/jmeter-2/src/main/java/com/baeldung/sharedthreadvars/controller/RestApi.java

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package com.baeldung.sharedthreadvars.controller;
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import java.util.HashMap;
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import java.util.Map;
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import java.util.UUID;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import org.springframework.http.HttpStatus;
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import org.springframework.web.bind.annotation.GetMapping;
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import org.springframework.web.bind.annotation.PostMapping;
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import org.springframework.web.bind.annotation.RequestBody;
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import org.springframework.web.bind.annotation.RequestMapping;
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import org.springframework.web.bind.annotation.RequestParam;
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import org.springframework.web.bind.annotation.RestController;
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import org.springframework.web.server.ResponseStatusException;
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@RestController
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@RequestMapping("/api")
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public class RestApi {
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private final Logger log = LoggerFactory.getLogger(RestApi.class);
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private Map<UUID, String> items = new HashMap<>();
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@PostMapping
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public String post(@RequestBody String name) {
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UUID uuid = UUID.randomUUID();
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items.put(uuid, name);
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log.debug("put {}={}", uuid, name);
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return uuid.toString();
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}
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@GetMapping
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public String get(@RequestParam("uuid") String uuid) {
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String name = items.remove(UUID.fromString(uuid));
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if (name == null)
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throw new ResponseStatusException(HttpStatus.EXPECTATION_FAILED);
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log.debug("get {}={}", uuid, name);
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return name;
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}
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}

‎testing-modules/jmeter-2/src/main/resources/com/baeldung/sharedthreadvars/config/bsh-shared.jmx

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<?xml version="1.0" encoding="UTF-8"?>
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<jmeterTestPlan version="1.2" properties="5.0" jmeter="5.6.3">
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<hashTree>
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<TestPlan guiclass="TestPlanGui" testclass="TestPlan" testname="Test Plan">
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<elementProp name="TestPlan.user_defined_variables" elementType="Arguments" guiclass="ArgumentsPanel" testclass="Arguments" testname="User Defined Variables">
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<collectionProp name="Arguments.arguments"/>
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</elementProp>
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<boolProp name="TestPlan.functional_mode">false</boolProp>
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<boolProp name="TestPlan.serialize_threadgroups">false</boolProp>
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</TestPlan>
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<hashTree>
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<SetupThreadGroup guiclass="SetupThreadGroupGui" testclass="SetupThreadGroup" testname="setup-threads">
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<intProp name="ThreadGroup.num_threads">3</intProp>
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<intProp name="ThreadGroup.ramp_time">1</intProp>
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<boolProp name="ThreadGroup.same_user_on_next_iteration">true</boolProp>
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<stringProp name="ThreadGroup.on_sample_error">continue</stringProp>
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<elementProp name="ThreadGroup.main_controller" elementType="LoopController" guiclass="LoopControlPanel" testclass="LoopController" testname="Loop Controller">
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<stringProp name="LoopController.loops">1</stringProp>
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<boolProp name="LoopController.continue_forever">false</boolProp>
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</elementProp>
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</SetupThreadGroup>
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<hashTree>
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<HTTPSamplerProxy guiclass="HttpTestSampleGui" testclass="HTTPSamplerProxy" testname="post-data">
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<stringProp name="HTTPSampler.domain">localhost</stringProp>
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<stringProp name="HTTPSampler.port">8080</stringProp>
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<stringProp name="HTTPSampler.path">/api</stringProp>
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<boolProp name="HTTPSampler.follow_redirects">true</boolProp>
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<stringProp name="HTTPSampler.method">POST</stringProp>
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<boolProp name="HTTPSampler.use_keepalive">true</boolProp>
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<boolProp name="HTTPSampler.postBodyRaw">true</boolProp>
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<elementProp name="HTTPsampler.Arguments" elementType="Arguments">
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<collectionProp name="Arguments.arguments">
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<elementProp name="" elementType="HTTPArgument">
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<boolProp name="HTTPArgument.always_encode">false</boolProp>
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<stringProp name="Argument.value">${__RandomString(5)}</stringProp>
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<stringProp name="Argument.metadata">=</stringProp>
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</elementProp>
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</collectionProp>
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</elementProp>
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</HTTPSamplerProxy>
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<hashTree/>
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<JSR223PostProcessor guiclass="TestBeanGUI" testclass="JSR223PostProcessor" testname="store-response">
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<stringProp name="cacheKey">true</stringProp>
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<stringProp name="filename"></stringProp>
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<stringProp name="parameters"></stringProp>
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<stringProp name="script">String response = prev.getResponseDataAsString();
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if (bsh.shared.uuidQueue == void) {
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bsh.shared.uuidQueue= new LinkedList();
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log.info(&quot;--&gt; setup: created queue&quot;);
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}
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bsh.shared.uuidQueue.add(response);
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log.info(&quot;--&gt; setup: &quot;+response);
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</stringProp>
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<stringProp name="scriptLanguage">java</stringProp>
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</JSR223PostProcessor>
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<hashTree/>
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</hashTree>
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<ThreadGroup guiclass="ThreadGroupGui" testclass="ThreadGroup" testname="worker-threads" enabled="true">
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<intProp name="ThreadGroup.num_threads">3</intProp>
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<intProp name="ThreadGroup.ramp_time">1</intProp>
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<boolProp name="ThreadGroup.same_user_on_next_iteration">true</boolProp>
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<stringProp name="ThreadGroup.on_sample_error">continue</stringProp>
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<elementProp name="ThreadGroup.main_controller" elementType="LoopController" guiclass="LoopControlPanel" testclass="LoopController" testname="Loop Controller">
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<stringProp name="LoopController.loops">1</stringProp>
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<boolProp name="LoopController.continue_forever">false</boolProp>
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</elementProp>
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</ThreadGroup>
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<hashTree>
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<JSR223PreProcessor guiclass="TestBeanGUI" testclass="JSR223PreProcessor" testname="prepare-request">
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<stringProp name="cacheKey">true</stringProp>
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<stringProp name="filename"></stringProp>
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<stringProp name="parameters"></stringProp>
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<stringProp name="script">String uuid = bsh.shared.uuidQueue.poll();
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vars.put(&quot;uuid&quot;, uuid);
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log.info(&quot;&lt;-- worker - next: &quot;+uuid);
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</stringProp>
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<stringProp name="scriptLanguage">java</stringProp>
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</JSR223PreProcessor>
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<hashTree/>
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<HTTPSamplerProxy guiclass="HttpTestSampleGui" testclass="HTTPSamplerProxy" testname="get-data" enabled="true">
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<stringProp name="HTTPSampler.domain">localhost</stringProp>
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<stringProp name="HTTPSampler.port">8080</stringProp>
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<stringProp name="HTTPSampler.path">/api?uuid=${uuid}</stringProp>
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<boolProp name="HTTPSampler.follow_redirects">true</boolProp>
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<stringProp name="HTTPSampler.method">GET</stringProp>
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<boolProp name="HTTPSampler.use_keepalive">true</boolProp>
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<boolProp name="HTTPSampler.postBodyRaw">false</boolProp>
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<elementProp name="HTTPsampler.Arguments" elementType="Arguments" guiclass="HTTPArgumentsPanel" testclass="Arguments" testname="User Defined Variables">
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<collectionProp name="Arguments.arguments"/>
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</elementProp>
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</HTTPSamplerProxy>
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<hashTree/>
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</hashTree>
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<ResultCollector guiclass="ViewResultsFullVisualizer" testclass="ResultCollector" testname="View Results Tree" enabled="true">
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<boolProp name="ResultCollector.error_logging">false</boolProp>
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<objProp>
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<name>saveConfig</name>
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<value class="SampleSaveConfiguration">
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<time>true</time>
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<latency>true</latency>
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<timestamp>true</timestamp>
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<success>true</success>
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<label>true</label>
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<code>true</code>
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<message>true</message>
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<threadName>true</threadName>
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<dataType>true</dataType>
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<encoding>false</encoding>
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<assertions>true</assertions>
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<subresults>true</subresults>
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<responseData>false</responseData>
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<samplerData>false</samplerData>
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<xml>false</xml>
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<fieldNames>true</fieldNames>
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<responseHeaders>false</responseHeaders>
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<requestHeaders>false</requestHeaders>
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<responseDataOnError>false</responseDataOnError>
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<saveAssertionResultsFailureMessage>true</saveAssertionResultsFailureMessage>
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<assertionsResultsToSave>0</assertionsResultsToSave>
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<bytes>true</bytes>
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<sentBytes>true</sentBytes>
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<url>true</url>
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<threadCounts>true</threadCounts>
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<idleTime>true</idleTime>
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<connectTime>true</connectTime>
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</value>
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</objProp>
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<stringProp name="filename"></stringProp>
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</ResultCollector>
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<hashTree/>
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</hashTree>
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</hashTree>
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</jmeterTestPlan>

‎testing-modules/jmeter-2/src/main/resources/com/baeldung/sharedthreadvars/config/shared-file.jmx

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<?xml version="1.0" encoding="UTF-8"?>
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<jmeterTestPlan version="1.2" properties="5.0" jmeter="5.6.3">
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<hashTree>
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<TestPlan guiclass="TestPlanGui" testclass="TestPlan" testname="Test Plan">
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<elementProp name="TestPlan.user_defined_variables" elementType="Arguments" guiclass="ArgumentsPanel" testclass="Arguments" testname="User Defined Variables">
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<collectionProp name="Arguments.arguments"/>
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</elementProp>
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<boolProp name="TestPlan.functional_mode">false</boolProp>
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<boolProp name="TestPlan.serialize_threadgroups">false</boolProp>
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</TestPlan>
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<hashTree>
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<SetupThreadGroup guiclass="SetupThreadGroupGui" testclass="SetupThreadGroup" testname="setup-threads">
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<intProp name="ThreadGroup.num_threads">3</intProp>
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<intProp name="ThreadGroup.ramp_time">1</intProp>
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<boolProp name="ThreadGroup.same_user_on_next_iteration">true</boolProp>
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<stringProp name="ThreadGroup.on_sample_error">continue</stringProp>
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<elementProp name="ThreadGroup.main_controller" elementType="LoopController" guiclass="LoopControlPanel" testclass="LoopController" testname="Loop Controller">
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<stringProp name="LoopController.loops">1</stringProp>
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<boolProp name="LoopController.continue_forever">false</boolProp>
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</elementProp>
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</SetupThreadGroup>
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<hashTree>
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<HTTPSamplerProxy guiclass="HttpTestSampleGui" testclass="HTTPSamplerProxy" testname="post-data" enabled="true">
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<stringProp name="HTTPSampler.domain">localhost</stringProp>
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<stringProp name="HTTPSampler.port">8080</stringProp>
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<stringProp name="HTTPSampler.path">/api</stringProp>
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<boolProp name="HTTPSampler.follow_redirects">true</boolProp>
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<stringProp name="HTTPSampler.method">POST</stringProp>
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<boolProp name="HTTPSampler.use_keepalive">true</boolProp>
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<boolProp name="HTTPSampler.postBodyRaw">true</boolProp>
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<elementProp name="HTTPsampler.Arguments" elementType="Arguments">
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<collectionProp name="Arguments.arguments">
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<elementProp name="" elementType="HTTPArgument">
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<boolProp name="HTTPArgument.always_encode">false</boolProp>
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<stringProp name="Argument.value">${__RandomString(5)}</stringProp>
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<stringProp name="Argument.metadata">=</stringProp>
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</elementProp>
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</collectionProp>
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</elementProp>
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</HTTPSamplerProxy>
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<hashTree/>
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<JSR223PostProcessor guiclass="TestBeanGUI" testclass="JSR223PostProcessor" testname="store-response">
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<stringProp name="cacheKey">true</stringProp>
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<stringProp name="filename"></stringProp>
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<stringProp name="parameters"></stringProp>
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<stringProp name="script">String response = prev.getResponseDataAsString();
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File file = new File(&quot;/tmp/shared-file&quot;+ctx.getThreadNum()+&quot;.txt&quot;);
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try {
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FileWriter writer = new FileWriter(file);
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writer.write(response);
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writer.close();
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log.info(&quot;--&gt; setup: &quot;+response+&quot; - &quot;+file);
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} catch (IOException e) {
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log.error(&quot;Failed to write response to file&quot;, e);
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}
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</stringProp>
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<stringProp name="scriptLanguage">java</stringProp>
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</JSR223PostProcessor>
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<hashTree/>
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</hashTree>
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<ThreadGroup guiclass="ThreadGroupGui" testclass="ThreadGroup" testname="worker-threads" enabled="true">
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<intProp name="ThreadGroup.num_threads">3</intProp>
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<intProp name="ThreadGroup.ramp_time">1</intProp>
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<boolProp name="ThreadGroup.same_user_on_next_iteration">true</boolProp>
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<stringProp name="ThreadGroup.on_sample_error">continue</stringProp>
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<elementProp name="ThreadGroup.main_controller" elementType="LoopController" guiclass="LoopControlPanel" testclass="LoopController" testname="Loop Controller">
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<stringProp name="LoopController.loops">1</stringProp>
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<boolProp name="LoopController.continue_forever">false</boolProp>
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</elementProp>
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</ThreadGroup>
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<hashTree>
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<JSR223PreProcessor guiclass="TestBeanGUI" testclass="JSR223PreProcessor" testname="prepare-request">
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<stringProp name="cacheKey">true</stringProp>
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<stringProp name="filename"></stringProp>
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<stringProp name="parameters"></stringProp>
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<stringProp name="script">File file = new File(&quot;/tmp/shared-file&quot;+ctx.getThreadNum()+&quot;.txt&quot;);
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try {
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Scanner reader = new Scanner(file);
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String uuid = reader.hasNextLine() ? reader.nextLine().trim() : &quot;&quot;;
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reader.close();
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vars.put(&quot;uuid&quot;, uuid);
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log.info(&quot;&lt;-- worker - next: &quot;+uuid+&quot; - &quot;+file);
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} catch (IOException e) {
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log.error(&quot;Failed to read response file&quot;, e);
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}
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</stringProp>
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<stringProp name="scriptLanguage">java</stringProp>
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</JSR223PreProcessor>
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<hashTree/>
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<HTTPSamplerProxy guiclass="HttpTestSampleGui" testclass="HTTPSamplerProxy" testname="get-data" enabled="true">
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<stringProp name="HTTPSampler.domain">localhost</stringProp>
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<stringProp name="HTTPSampler.port">8080</stringProp>
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<stringProp name="HTTPSampler.path">/api?uuid=${uuid}</stringProp>
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<boolProp name="HTTPSampler.follow_redirects">true</boolProp>
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<stringProp name="HTTPSampler.method">GET</stringProp>
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<boolProp name="HTTPSampler.use_keepalive">true</boolProp>
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<boolProp name="HTTPSampler.postBodyRaw">false</boolProp>
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<elementProp name="HTTPsampler.Arguments" elementType="Arguments" guiclass="HTTPArgumentsPanel" testclass="Arguments" testname="User Defined Variables">
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<collectionProp name="Arguments.arguments"/>
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</elementProp>
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</HTTPSamplerProxy>
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<hashTree/>
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</hashTree>
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<ResultCollector guiclass="ViewResultsFullVisualizer" testclass="ResultCollector" testname="View Results Tree" enabled="true">
109+
<boolProp name="ResultCollector.error_logging">false</boolProp>
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<objProp>
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<name>saveConfig</name>
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<value class="SampleSaveConfiguration">
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<time>true</time>
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<latency>true</latency>
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<timestamp>true</timestamp>
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<success>true</success>
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<label>true</label>
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<code>true</code>
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<message>true</message>
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<threadName>true</threadName>
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<dataType>true</dataType>
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<encoding>false</encoding>
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<assertions>true</assertions>
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<subresults>true</subresults>
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<responseData>false</responseData>
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<samplerData>false</samplerData>
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<xml>false</xml>
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<fieldNames>true</fieldNames>
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<responseHeaders>false</responseHeaders>
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<requestHeaders>false</requestHeaders>
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<responseDataOnError>false</responseDataOnError>
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<saveAssertionResultsFailureMessage>true</saveAssertionResultsFailureMessage>
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<assertionsResultsToSave>0</assertionsResultsToSave>
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<bytes>true</bytes>
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<sentBytes>true</sentBytes>
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<url>true</url>
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<threadCounts>true</threadCounts>
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<idleTime>true</idleTime>
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<connectTime>true</connectTime>
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</value>
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</objProp>
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<stringProp name="filename"></stringProp>
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</ResultCollector>
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<hashTree/>
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</hashTree>
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</hashTree>
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</jmeterTestPlan>

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