Introduce Nullaway to the project

Author: cppwfs

.mvn/jvm.config

@@ -1 +1,11 @@
 -Xmx1024m -XX:CICompilerCount=1 -XX:TieredStopAtLevel=1 -Djava.security.egd=file:/dev/./urandom
+--add-exports jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED
+--add-exports jdk.compiler/com.sun.tools.javac.file=ALL-UNNAMED
+--add-exports jdk.compiler/com.sun.tools.javac.main=ALL-UNNAMED
+--add-exports jdk.compiler/com.sun.tools.javac.model=ALL-UNNAMED
+--add-exports jdk.compiler/com.sun.tools.javac.parser=ALL-UNNAMED
+--add-exports jdk.compiler/com.sun.tools.javac.processing=ALL-UNNAMED
+--add-exports jdk.compiler/com.sun.tools.javac.tree=ALL-UNNAMED
+--add-exports jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED
+--add-opens jdk.compiler/com.sun.tools.javac.code=ALL-UNNAMED
+--add-opens jdk.compiler/com.sun.tools.javac.comp=ALL-UNNAMED

.mvn/maven.config

@@ -1,2 +1,3 @@
 -DaltSnapshotDeploymentRepository=repo.spring.io::default::https://repo.spring.io/libs-snapshot-local
+-Djspecify.enabled=true
 -P spring

spring-cloud-starter-single-step-batch-job/src/main/java/org/springframework/cloud/task/batch/autoconfigure/flatfile/package-info.java

@@ -18,4 +18,7 @@
  * Auto-configuration classes for flat file item readers and writers in single-step batch
  * jobs.
  */
+@NullMarked
 package org.springframework.cloud.task.batch.autoconfigure.flatfile;
+
+import org.jspecify.annotations.NullMarked;

spring-cloud-starter-single-step-batch-job/src/main/java/org/springframework/cloud/task/batch/autoconfigure/jdbc/package-info.java

@@ -17,4 +17,7 @@
 /**
  * Auto-configuration classes for JDBC item readers and writers in single-step batch jobs.
  */
+@NullMarked
 package org.springframework.cloud.task.batch.autoconfigure.jdbc;
+
+import org.jspecify.annotations.NullMarked;

spring-cloud-starter-single-step-batch-job/src/main/java/org/springframework/cloud/task/batch/autoconfigure/kafka/package-info.java

@@ -18,4 +18,7 @@
  * Auto-configuration classes for Kafka item readers and writers in single-step batch
  * jobs.
  */
+@NullMarked
 package org.springframework.cloud.task.batch.autoconfigure.kafka;
+
+import org.jspecify.annotations.NullMarked;

spring-cloud-starter-single-step-batch-job/src/main/java/org/springframework/cloud/task/batch/autoconfigure/package-info.java

@@ -17,4 +17,7 @@
 /**
  * Auto-configuration classes for Spring Cloud Task single-step batch jobs.
  */
+@NullMarked
 package org.springframework.cloud.task.batch.autoconfigure;
+
+import org.jspecify.annotations.NullMarked;

spring-cloud-starter-single-step-batch-job/src/main/java/org/springframework/cloud/task/batch/autoconfigure/rabbit/package-info.java

@@ -18,4 +18,7 @@
  * Auto-configuration classes for RabbitMQ item readers and writers in single-step batch
  * jobs.
  */
+@NullMarked
 package org.springframework.cloud.task.batch.autoconfigure.rabbit;
+
+import org.jspecify.annotations.NullMarked;

spring-cloud-task-batch/src/main/java/org/springframework/cloud/task/batch/configuration/package-info.java

@@ -17,4 +17,7 @@
 /**
  * Configuration classes for Spring Cloud Task Batch integration.
  */
+@NullMarked
 package org.springframework.cloud.task.batch.configuration;
+
+import org.jspecify.annotations.NullMarked;

spring-cloud-task-batch/src/main/java/org/springframework/cloud/task/batch/handler/package-info.java

@@ -17,4 +17,7 @@
 /**
  * Handler components for Spring Cloud Task Batch integration.
  */
+@NullMarked
 package org.springframework.cloud.task.batch.handler;
+
+import org.jspecify.annotations.NullMarked;

spring-cloud-task-batch/src/main/java/org/springframework/cloud/task/batch/listener/package-info.java

@@ -17,4 +17,7 @@
 /**
  * Listener components for Spring Cloud Task Batch integration.
  */
+@NullMarked
 package org.springframework.cloud.task.batch.listener;
+
+import org.jspecify.annotations.NullMarked;