JMeter从JSON响应提取大量账户名称时报错求助

问题背景 #

尝试从JSON响应体中提取所有账户名称时，JSR223脚本执行报错，最初怀疑是数据量过大导致，实际为语法使用错误。

原错误代码 #

import groovy.json.JsonSlurper;

def responseBD = new groovy.json.JsonSlurper().parse(prev.getResponseData());
def studyName = [];
responseBD.accounts.name { studyNameFetched->
    //studyName << studyNameFetched
    log.info("Reference Value : "+studyNameFetched)
}

错误详情 #

2023-05-30 12:11:22,577 INFO o.a.j.e.StandardJMeterEngine: Running the test!
2023-05-30 12:11:22,577 INFO o.a.j.s.SampleEvent: List of sample_variables: []
2023-05-30 12:11:22,577 INFO o.a.j.g.u.JMeterMenuBar: setRunning(true, *local*)
2023-05-30 12:11:22,619 INFO o.a.j.e.StandardJMeterEngine: Starting ThreadGroup: 1 : Thread Group
2023-05-30 12:11:22,619 INFO o.a.j.e.StandardJMeterEngine: Starting 1 threads for group Thread Group.
2023-05-30 12:11:22,619 INFO o.a.j.e.StandardJMeterEngine: Thread will continue on error
2023-05-30 12:11:22,619 INFO o.a.j.t.ThreadGroup: Starting thread group... number=1 threads=1 ramp-up=1 delayedStart=false
2023-05-30 12:11:22,624 INFO o.a.j.t.ThreadGroup: Started thread group number 1
2023-05-30 12:11:22,624 INFO o.a.j.e.StandardJMeterEngine: All thread groups have been started
2023-05-30 12:11:22,624 INFO o.a.j.t.JMeterThread: Thread started: Thread Group 1-1
2023-05-30 12:12:14,933 ERROR o.a.j.e.JSR223PostProcessor: Problem in JSR223 script, JSR223 PostProcessor
javax.script.ScriptException: groovy.lang.MissingMethodException: No signature of method: java.util.ArrayList.name() is applicable for argument types: (Script8$_run_closure1) values: [Script8$_run_closure1@68c01c8b]
Possible solutions: any(), max(), take(int), take(int), wait(), size()
            at org.codehaus.groovy.jsr223.GroovyScriptEngineImpl.eval(GroovyScriptEngineImpl.java:320) ~[groovy-jsr223-3.0.11.jar:3.0.11]
            at org.codehaus.groovy.jsr223.GroovyCompiledScript.eval(GroovyCompiledScript.java:71) ~[groovy-jsr223-3.0.11.jar:3.0.11]
            at javax.script.CompiledScript.eval(CompiledScript.java:93) ~[java.scripting:?]
            at org.apache.jmeter.util.JSR223TestElement.processFileOrScript(JSR223TestElement.java:217) ~[ApacheJMeter_core.jar:5.5]
            at org.apache.jmeter.extractor.JSR223PostProcessor.process(JSR223PostProcessor.java:45) ~[ApacheJMeter_components.jar:5.5]
            at org.apache.jmeter.threads.JMeterThread.runPostProcessors(JMeterThread.java:968) ~[ApacheJMeter_core.jar:5.5]
            at org.apache.jmeter.threads.JMeterThread.executeSamplePackage(JMeterThread.java:585) ~[ApacheJMeter_core.jar:5.5]
            at org.apache.jmeter.threads.JMeterThread.processSampler(JMeterThread.java:501) ~[ApacheJMeter_core.jar:5.5]
            at org.apache.jmeter.threads.JMeterThread.run(JMeterThread.java:268) ~[ApacheJMeter_core.jar:5.5]
            at java.lang.Thread.run(Thread.java:833) ~[?:?]
Caused by: groovy.lang.MissingMethodException: No signature of method: java.util.ArrayList.name() is applicable for argument types: (Script8$_run_closure1) values: [Script8$_run_closure1@68c01c8b]
Possible solutions: any(), max(), take(int), take(int), wait(), size()
            at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.unwrap(ScriptBytecodeAdapter.java:70) ~[groovy-3.0.11.jar:3.0.11]
            at org.codehaus.groovy.runtime.callsite.PojoMetaClassSite.call(PojoMetaClassSite.java:46) ~[groovy-3.0.11.jar:3.0.11]
            at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:47) ~[groovy-3.0.11.jar:3.0.11]
            at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:125) ~[groovy-3.0.11.jar:3.0.11]
            at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:139) ~[groovy-3.0.11.jar:3.0.11]
            at Script8.run(Script8.groovy:7) ~[?:?]
            at org.codehaus.groovy.jsr223.GroovyScriptEngineImpl.eval(GroovyScriptEngineImpl.java:317) ~[groovy-jsr223-3.0.11.jar:3.0.11]
            ... 9 more
2023-05-30 12:12:14,936 INFO o.a.j.t.JMeterThread: Thread is done: Thread Group 1-1
2023-05-30 12:12:14,936 INFO o.a.j.t.JMeterThread: Thread finished: Thread Group 1-1
2023-05-30 12:12:14,937 INFO o.a.j.e.StandardJMeterEngine: Notifying test listeners of end of test
2023-05-30 12:12:14,937 INFO o.a.j.g.u.JMeterMenuBar: setRunning(false, *local*)

响应数据示例 #

{
    "page": {
        "number": 1,
        "more": 0,
        "rows": 5000
    },
    "accounts": [
        {
            "name": "Enterprise Site Management",
            "uuid": "6656dae1-159a-4062-9cbb-5382d5202cd8"
        },
        {
            "name": "R2_Single QC",
            "uuid": "197650ca-d8fc-451d-9332-50d801b5c426"
        },
        {
            "name": "GUAC",
            "uuid": "ac7adabd-8040-498b-87ed-9c69d678ad49"
        },
        {
            "name": "PushkarTIMS-0501",
            "uuid": "0210da27-1724-40bb-a618-005103bb5970"
        },
        {
            "name": "ppp",
           "uuid": "8b982528-5fef-49d6-a016-e56c1de25c89"
        }
    ]
}

错误原因 #

报错核心是groovy.lang.MissingMethodException，说明responseBD.accounts是ArrayList类型，不能直接调用name()方法并传入闭包。原代码试图直接对数组调用name方法遍历，不符合Groovy语法规范。

当前报错和数据量无关，只要语法正确，即使响应包含5000条数据也能正常处理（若数据量极大，可考虑优化内存，但当前问题不涉及）。

修正后的脚本 #

方式1：遍历数组提取名称并打印 #

import groovy.json.JsonSlurper

def responseBD = new JsonSlurper().parse(prev.getResponseData())
def accountNames = []

// 遍历accounts数组，提取每个元素的name属性
responseBD.accounts.each { account ->
    def name = account.name
    accountNames << name
    log.info("账户名称: ${name}")
}

// 可选：将提取的名称存储为JMeter变量，方便后续使用
vars.putObject("accountNames", accountNames)

方式2：快速提取所有名称到列表（更简洁） #

import groovy.json.JsonSlurper

def responseBD = new JsonSlurper().parse(prev.getResponseData())
def accountNames = responseBD.accounts.name // Groovy支持直接对数组提取属性，返回属性列表

accountNames.each { name ->
    log.info("账户名称: ${name}")
}

vars.putObject("accountNames", accountNames)

说明 #

• 两种方式都能正确提取所有账户名称，方式2利用Groovy特性更简洁；
• 若后续需要使用提取的名称列表，可通过vars.putObject存储，在其他组件中通过${__groovy(vars.getObject("accountNames"),)}调用；
• 若数据量超过万级，建议使用JsonSlurperClassic替代JsonSlurper以减少内存占用，但当前5000条数据无需调整。

内容的提问来源于stack exchange，提问作者Jyoti Prakash Mallick