CAMEL-23289: Fix empty catch blocks and resource leaks in DrillProducer

[oscerd]

Summary

• Replace empty catch blocks in DrillProducer.doStop() with LOG.debug() logging and add null check for connection
• Replace manual Statement/ResultSet close with try-with-resources in process(), fixing a potential NullPointerException when executeQuery() throws
• Add 5 unit tests covering resource cleanup, exception handling, and null-safety

Test plan

• New DrillProducerTest with 5 tests (all pass)
• Existing tests unaffected (7 run, 0 failures, 1 skipped — pre-existing @Disabled)
• CI green

Claude Code on behalf of Andrea Cosentino

🤖 Generated with Claude Code

[github-actions]

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[github-actions]

🧪 CI tested the following changed modules:

• components/camel-drill

All tested modules (72 modules)

• Camel :: All Components Sync point
• Camel :: All Components Sync point [pom]
• Camel :: Assembly
• Camel :: Assembly [pom]
• Camel :: Catalog :: CSimple Maven Plugin (deprecated) [maven-plugin]
• Camel :: Catalog :: CSimple Maven Plugin (deprecated) SUCCESS [ 1.560 s]
• Camel :: Catalog :: Camel Catalog
• Camel :: Catalog :: Camel Catalog [jar]
• Camel :: Catalog :: Camel Report Maven Plugin
• Camel :: Catalog :: Camel Report Maven Plugin [maven-plugin]
• Camel :: Catalog :: Camel Route Parser
• Camel :: Catalog :: Camel Route Parser [jar]
• Camel :: Catalog :: Console
• Camel :: Catalog :: Console [jar]
• Camel :: Catalog :: Dummy Component
• Camel :: Catalog :: Dummy Component [jar]
• Camel :: Catalog :: Lucene (deprecated)
• Camel :: Catalog :: Lucene (deprecated) [jar]
• Camel :: Catalog :: Maven
• Camel :: Catalog :: Maven [jar]
• Camel :: Catalog :: Suggest
• Camel :: Catalog :: Suggest [jar]
• Camel :: Component DSL
• Camel :: Component DSL [jar]
• Camel :: Coverage
• Camel :: Coverage [pom]
• Camel :: Docs
• Camel :: Docs [pom]
• Camel :: Drill
• Camel :: Drill [jar]
• Camel :: Endpoint DSL
• Camel :: Endpoint DSL [jar]
• Camel :: Endpoint DSL :: Support
• Camel :: Endpoint DSL :: Support [jar]
• Camel :: Integration Tests
• Camel :: Integration Tests [jar]
• Camel :: JBang :: Core
• Camel :: JBang :: Core [jar]
• Camel :: JBang :: Integration tests
• Camel :: JBang :: Integration tests [jar]
• Camel :: JBang :: MCP
• Camel :: JBang :: MCP [jar]
• Camel :: JBang :: Main
• Camel :: JBang :: Main [jar]
• Camel :: JBang :: Plugin :: Edit
• Camel :: JBang :: Plugin :: Edit [jar]
• Camel :: JBang :: Plugin :: Generate
• Camel :: JBang :: Plugin :: Generate [jar]
• Camel :: JBang :: Plugin :: Kubernetes
• Camel :: JBang :: Plugin :: Kubernetes [jar]
• Camel :: JBang :: Plugin :: Route Parser
• Camel :: JBang :: Plugin :: Route Parser [jar]
• Camel :: JBang :: Plugin :: Testing
• Camel :: JBang :: Plugin :: Testing [jar]
• Camel :: JBang :: Plugin :: Validate
• Camel :: JBang :: Plugin :: Validate [jar]
• Camel :: Kamelet Main
• Camel :: Kamelet Main [jar]
• Camel :: Launcher
• Camel :: Launcher [jar]
• Camel :: Launcher :: Container
• Camel :: Launcher :: Container [pom]
• Camel :: YAML DSL
• Camel :: YAML DSL [jar]
• Camel :: YAML DSL :: Deserializers
• Camel :: YAML DSL :: Deserializers [jar]
• Camel :: YAML DSL :: Maven Plugins
• Camel :: YAML DSL :: Maven Plugins [maven-plugin]
• Camel :: YAML DSL :: Validator
• Camel :: YAML DSL :: Validator [jar]
• Camel :: YAML DSL :: Validator Maven Plugin
• Camel :: YAML DSL :: Validator Maven Plugin [maven-plugin]

[apupier]

sonar workflow is not working #22435 , not specific to this PR