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Bael-3842 - How to Pass a Variable From One Thread Group to Another in JMeter #18687

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Merged
merged 3 commits into from
Jul 28, 2025
Merged

Bael-3842 - How to Pass a Variable From One Thread Group to Another in JMeter #18687

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b8e70cc
first draft
ulisseslima Jul 17, 2025
8591614
Merge branch 'master' into bael-3842-jmeter-shared-variables
ulisseslima Jul 17, 2025
3d1340e
renaming to avoid errors with RetrieveUuidControllerUnitTest
ulisseslima Jul 17, 2025
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12 changes: 12 additions & 0 deletions ...les/jmeter-2/src/main/java/com/baeldung/sharedthreadvars/SharedThreadVarsApplication.java
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package com.baeldung.sharedthreadvars;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class SharedThreadVarsApplication {

public static void main(String[] args) {
SpringApplication.run(SharedThreadVarsApplication.class, args);
}
}
19 changes: 19 additions & 0 deletions ...es/jmeter-2/src/main/java/com/baeldung/sharedthreadvars/config/SecurityConfiguration.java
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package com.baeldung.sharedthreadvars.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configurers.CsrfConfigurer;
import org.springframework.security.web.SecurityFilterChain;

@Configuration
public class SecurityConfiguration {

@Bean
public SecurityFilterChain configure(HttpSecurity http) throws Exception {
http.csrf(CsrfConfigurer::disable)
.authorizeHttpRequests(auth -> auth.anyRequest()
.permitAll());
return http.build();
}
}
45 changes: 45 additions & 0 deletions testing-modules/jmeter-2/src/main/java/com/baeldung/sharedthreadvars/controller/RestApi.java
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package com.baeldung.sharedthreadvars.controller;

import java.util.HashMap;
import java.util.Map;
import java.util.UUID;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.server.ResponseStatusException;

@RestController
@RequestMapping("/api")
public class RestApi {

private final Logger log = LoggerFactory.getLogger(RestApi.class);

private Map<UUID, String> items = new HashMap<>();

@PostMapping
public String post(@RequestBody String name) {
UUID uuid = UUID.randomUUID();
items.put(uuid, name);

log.debug("put {}={}", uuid, name);
return uuid.toString();
}

@GetMapping
public String get(@RequestParam("uuid") String uuid) {
String name = items.remove(UUID.fromString(uuid));

if (name == null)
throw new ResponseStatusException(HttpStatus.EXPECTATION_FAILED);

log.debug("get {}={}", uuid, name);
return name;
}
}
136 changes: 136 additions & 0 deletions ...g-modules/jmeter-2/src/main/resources/com/baeldung/sharedthreadvars/config/bsh-shared.jmx
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<?xml version="1.0" encoding="UTF-8"?>
<jmeterTestPlan version="1.2" properties="5.0" jmeter="5.6.3">
<hashTree>
<TestPlan guiclass="TestPlanGui" testclass="TestPlan" testname="Test Plan">
<elementProp name="TestPlan.user_defined_variables" elementType="Arguments" guiclass="ArgumentsPanel" testclass="Arguments" testname="User Defined Variables">
<collectionProp name="Arguments.arguments"/>
</elementProp>
<boolProp name="TestPlan.functional_mode">false</boolProp>
<boolProp name="TestPlan.serialize_threadgroups">false</boolProp>
</TestPlan>
<hashTree>
<SetupThreadGroup guiclass="SetupThreadGroupGui" testclass="SetupThreadGroup" testname="setup-threads">
<intProp name="ThreadGroup.num_threads">3</intProp>
<intProp name="ThreadGroup.ramp_time">1</intProp>
<boolProp name="ThreadGroup.same_user_on_next_iteration">true</boolProp>
<stringProp name="ThreadGroup.on_sample_error">continue</stringProp>
<elementProp name="ThreadGroup.main_controller" elementType="LoopController" guiclass="LoopControlPanel" testclass="LoopController" testname="Loop Controller">
<stringProp name="LoopController.loops">1</stringProp>
<boolProp name="LoopController.continue_forever">false</boolProp>
</elementProp>
</SetupThreadGroup>
<hashTree>
<HTTPSamplerProxy guiclass="HttpTestSampleGui" testclass="HTTPSamplerProxy" testname="post-data">
<stringProp name="HTTPSampler.domain">localhost</stringProp>
<stringProp name="HTTPSampler.port">8080</stringProp>
<stringProp name="HTTPSampler.path">/api</stringProp>
<boolProp name="HTTPSampler.follow_redirects">true</boolProp>
<stringProp name="HTTPSampler.method">POST</stringProp>
<boolProp name="HTTPSampler.use_keepalive">true</boolProp>
<boolProp name="HTTPSampler.postBodyRaw">true</boolProp>
<elementProp name="HTTPsampler.Arguments" elementType="Arguments">
<collectionProp name="Arguments.arguments">
<elementProp name="" elementType="HTTPArgument">
<boolProp name="HTTPArgument.always_encode">false</boolProp>
<stringProp name="Argument.value">${__RandomString(5)}</stringProp>
<stringProp name="Argument.metadata">=</stringProp>
</elementProp>
</collectionProp>
</elementProp>
</HTTPSamplerProxy>
<hashTree/>
<JSR223PostProcessor guiclass="TestBeanGUI" testclass="JSR223PostProcessor" testname="store-response">
<stringProp name="cacheKey">true</stringProp>
<stringProp name="filename"></stringProp>
<stringProp name="parameters"></stringProp>
<stringProp name="script">String response = prev.getResponseDataAsString();

if (bsh.shared.uuidQueue == void) {
bsh.shared.uuidQueue= new LinkedList();
log.info(&quot;--&gt; setup: created queue&quot;);
}
bsh.shared.uuidQueue.add(response);

log.info(&quot;--&gt; setup: &quot;+response);
</stringProp>
<stringProp name="scriptLanguage">java</stringProp>
</JSR223PostProcessor>
<hashTree/>
</hashTree>
<ThreadGroup guiclass="ThreadGroupGui" testclass="ThreadGroup" testname="worker-threads" enabled="true">
<intProp name="ThreadGroup.num_threads">3</intProp>
<intProp name="ThreadGroup.ramp_time">1</intProp>
<boolProp name="ThreadGroup.same_user_on_next_iteration">true</boolProp>
<stringProp name="ThreadGroup.on_sample_error">continue</stringProp>
<elementProp name="ThreadGroup.main_controller" elementType="LoopController" guiclass="LoopControlPanel" testclass="LoopController" testname="Loop Controller">
<stringProp name="LoopController.loops">1</stringProp>
<boolProp name="LoopController.continue_forever">false</boolProp>
</elementProp>
</ThreadGroup>
<hashTree>
<JSR223PreProcessor guiclass="TestBeanGUI" testclass="JSR223PreProcessor" testname="prepare-request">
<stringProp name="cacheKey">true</stringProp>
<stringProp name="filename"></stringProp>
<stringProp name="parameters"></stringProp>
<stringProp name="script">String uuid = bsh.shared.uuidQueue.poll();
vars.put(&quot;uuid&quot;, uuid);

log.info(&quot;&lt;-- worker - next: &quot;+uuid);
</stringProp>
<stringProp name="scriptLanguage">java</stringProp>
</JSR223PreProcessor>
<hashTree/>
<HTTPSamplerProxy guiclass="HttpTestSampleGui" testclass="HTTPSamplerProxy" testname="get-data" enabled="true">
<stringProp name="HTTPSampler.domain">localhost</stringProp>
<stringProp name="HTTPSampler.port">8080</stringProp>
<stringProp name="HTTPSampler.path">/api?uuid=${uuid}</stringProp>
<boolProp name="HTTPSampler.follow_redirects">true</boolProp>
<stringProp name="HTTPSampler.method">GET</stringProp>
<boolProp name="HTTPSampler.use_keepalive">true</boolProp>
<boolProp name="HTTPSampler.postBodyRaw">false</boolProp>
<elementProp name="HTTPsampler.Arguments" elementType="Arguments" guiclass="HTTPArgumentsPanel" testclass="Arguments" testname="User Defined Variables">
<collectionProp name="Arguments.arguments"/>
</elementProp>
</HTTPSamplerProxy>
<hashTree/>
</hashTree>
<ResultCollector guiclass="ViewResultsFullVisualizer" testclass="ResultCollector" testname="View Results Tree" enabled="true">
<boolProp name="ResultCollector.error_logging">false</boolProp>
<objProp>
<name>saveConfig</name>
<value class="SampleSaveConfiguration">
<time>true</time>
<latency>true</latency>
<timestamp>true</timestamp>
<success>true</success>
<label>true</label>
<code>true</code>
<message>true</message>
<threadName>true</threadName>
<dataType>true</dataType>
<encoding>false</encoding>
<assertions>true</assertions>
<subresults>true</subresults>
<responseData>false</responseData>
<samplerData>false</samplerData>
<xml>false</xml>
<fieldNames>true</fieldNames>
<responseHeaders>false</responseHeaders>
<requestHeaders>false</requestHeaders>
<responseDataOnError>false</responseDataOnError>
<saveAssertionResultsFailureMessage>true</saveAssertionResultsFailureMessage>
<assertionsResultsToSave>0</assertionsResultsToSave>
<bytes>true</bytes>
<sentBytes>true</sentBytes>
<url>true</url>
<threadCounts>true</threadCounts>
<idleTime>true</idleTime>
<connectTime>true</connectTime>
</value>
</objProp>
<stringProp name="filename"></stringProp>
</ResultCollector>
<hashTree/>
</hashTree>
</hashTree>
</jmeterTestPlan>
147 changes: 147 additions & 0 deletions ...-modules/jmeter-2/src/main/resources/com/baeldung/sharedthreadvars/config/shared-file.jmx
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<?xml version="1.0" encoding="UTF-8"?>
<jmeterTestPlan version="1.2" properties="5.0" jmeter="5.6.3">
<hashTree>
<TestPlan guiclass="TestPlanGui" testclass="TestPlan" testname="Test Plan">
<elementProp name="TestPlan.user_defined_variables" elementType="Arguments" guiclass="ArgumentsPanel" testclass="Arguments" testname="User Defined Variables">
<collectionProp name="Arguments.arguments"/>
</elementProp>
<boolProp name="TestPlan.functional_mode">false</boolProp>
<boolProp name="TestPlan.serialize_threadgroups">false</boolProp>
</TestPlan>
<hashTree>
<SetupThreadGroup guiclass="SetupThreadGroupGui" testclass="SetupThreadGroup" testname="setup-threads">
<intProp name="ThreadGroup.num_threads">3</intProp>
<intProp name="ThreadGroup.ramp_time">1</intProp>
<boolProp name="ThreadGroup.same_user_on_next_iteration">true</boolProp>
<stringProp name="ThreadGroup.on_sample_error">continue</stringProp>
<elementProp name="ThreadGroup.main_controller" elementType="LoopController" guiclass="LoopControlPanel" testclass="LoopController" testname="Loop Controller">
<stringProp name="LoopController.loops">1</stringProp>
<boolProp name="LoopController.continue_forever">false</boolProp>
</elementProp>
</SetupThreadGroup>
<hashTree>
<HTTPSamplerProxy guiclass="HttpTestSampleGui" testclass="HTTPSamplerProxy" testname="post-data" enabled="true">
<stringProp name="HTTPSampler.domain">localhost</stringProp>
<stringProp name="HTTPSampler.port">8080</stringProp>
<stringProp name="HTTPSampler.path">/api</stringProp>
<boolProp name="HTTPSampler.follow_redirects">true</boolProp>
<stringProp name="HTTPSampler.method">POST</stringProp>
<boolProp name="HTTPSampler.use_keepalive">true</boolProp>
<boolProp name="HTTPSampler.postBodyRaw">true</boolProp>
<elementProp name="HTTPsampler.Arguments" elementType="Arguments">
<collectionProp name="Arguments.arguments">
<elementProp name="" elementType="HTTPArgument">
<boolProp name="HTTPArgument.always_encode">false</boolProp>
<stringProp name="Argument.value">${__RandomString(5)}</stringProp>
<stringProp name="Argument.metadata">=</stringProp>
</elementProp>
</collectionProp>
</elementProp>
</HTTPSamplerProxy>
<hashTree/>
<JSR223PostProcessor guiclass="TestBeanGUI" testclass="JSR223PostProcessor" testname="store-response">
<stringProp name="cacheKey">true</stringProp>
<stringProp name="filename"></stringProp>
<stringProp name="parameters"></stringProp>
<stringProp name="script">String response = prev.getResponseDataAsString();
File file = new File(&quot;/tmp/shared-file&quot;+ctx.getThreadNum()+&quot;.txt&quot;);

try {
FileWriter writer = new FileWriter(file);
writer.write(response);
writer.close();
log.info(&quot;--&gt; setup: &quot;+response+&quot; - &quot;+file);
} catch (IOException e) {
log.error(&quot;Failed to write response to file&quot;, e);
}
</stringProp>
<stringProp name="scriptLanguage">java</stringProp>
</JSR223PostProcessor>
<hashTree/>
</hashTree>
<ThreadGroup guiclass="ThreadGroupGui" testclass="ThreadGroup" testname="worker-threads" enabled="true">
<intProp name="ThreadGroup.num_threads">3</intProp>
<intProp name="ThreadGroup.ramp_time">1</intProp>
<boolProp name="ThreadGroup.same_user_on_next_iteration">true</boolProp>
<stringProp name="ThreadGroup.on_sample_error">continue</stringProp>
<elementProp name="ThreadGroup.main_controller" elementType="LoopController" guiclass="LoopControlPanel" testclass="LoopController" testname="Loop Controller">
<stringProp name="LoopController.loops">1</stringProp>
<boolProp name="LoopController.continue_forever">false</boolProp>
</elementProp>
</ThreadGroup>
<hashTree>
<JSR223PreProcessor guiclass="TestBeanGUI" testclass="JSR223PreProcessor" testname="prepare-request">
<stringProp name="cacheKey">true</stringProp>
<stringProp name="filename"></stringProp>
<stringProp name="parameters"></stringProp>
<stringProp name="script">File file = new File(&quot;/tmp/shared-file&quot;+ctx.getThreadNum()+&quot;.txt&quot;);

try {
Scanner reader = new Scanner(file);
String uuid = reader.hasNextLine() ? reader.nextLine().trim() : &quot;&quot;;
reader.close();

vars.put(&quot;uuid&quot;, uuid);

log.info(&quot;&lt;-- worker - next: &quot;+uuid+&quot; - &quot;+file);
} catch (IOException e) {
log.error(&quot;Failed to read response file&quot;, e);
}
</stringProp>
<stringProp name="scriptLanguage">java</stringProp>
</JSR223PreProcessor>
<hashTree/>
<HTTPSamplerProxy guiclass="HttpTestSampleGui" testclass="HTTPSamplerProxy" testname="get-data" enabled="true">
<stringProp name="HTTPSampler.domain">localhost</stringProp>
<stringProp name="HTTPSampler.port">8080</stringProp>
<stringProp name="HTTPSampler.path">/api?uuid=${uuid}</stringProp>
<boolProp name="HTTPSampler.follow_redirects">true</boolProp>
<stringProp name="HTTPSampler.method">GET</stringProp>
<boolProp name="HTTPSampler.use_keepalive">true</boolProp>
<boolProp name="HTTPSampler.postBodyRaw">false</boolProp>
<elementProp name="HTTPsampler.Arguments" elementType="Arguments" guiclass="HTTPArgumentsPanel" testclass="Arguments" testname="User Defined Variables">
<collectionProp name="Arguments.arguments"/>
</elementProp>
</HTTPSamplerProxy>
<hashTree/>
</hashTree>
<ResultCollector guiclass="ViewResultsFullVisualizer" testclass="ResultCollector" testname="View Results Tree" enabled="true">
<boolProp name="ResultCollector.error_logging">false</boolProp>
<objProp>
<name>saveConfig</name>
<value class="SampleSaveConfiguration">
<time>true</time>
<latency>true</latency>
<timestamp>true</timestamp>
<success>true</success>
<label>true</label>
<code>true</code>
<message>true</message>
<threadName>true</threadName>
<dataType>true</dataType>
<encoding>false</encoding>
<assertions>true</assertions>
<subresults>true</subresults>
<responseData>false</responseData>
<samplerData>false</samplerData>
<xml>false</xml>
<fieldNames>true</fieldNames>
<responseHeaders>false</responseHeaders>
<requestHeaders>false</requestHeaders>
<responseDataOnError>false</responseDataOnError>
<saveAssertionResultsFailureMessage>true</saveAssertionResultsFailureMessage>
<assertionsResultsToSave>0</assertionsResultsToSave>
<bytes>true</bytes>
<sentBytes>true</sentBytes>
<url>true</url>
<threadCounts>true</threadCounts>
<idleTime>true</idleTime>
<connectTime>true</connectTime>
</value>
</objProp>
<stringProp name="filename"></stringProp>
</ResultCollector>
<hashTree/>
</hashTree>
</hashTree>
</jmeterTestPlan>
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