JMeter处理大JSON文件报错求助：URLDecoder非法转义字符问题

问题场景 #

处理约5.5万行的大JSON输入时，使用__FileToString函数读取文件内容后触发解析错误，该请求在Postman中可正常运行。

使用的函数 #

${__FileToString(myPath/test.json,,)}

错误日志 #

java.lang.IllegalArgumentException: URLDecoder: Illegal hex characters in escape (%) pattern - For input string: "1["

    at java.net.URLDecoder.decode(Unknown Source) ~[?:1.8.0_301]
    at org.apache.jmeter.protocol.http.visualizers.RequestViewHTTP.decodeQuery(RequestViewHTTP.java:336) ~[ApacheJMeter_http.jar:5.5]
    at org.apache.jmeter.protocol.http.visualizers.RequestViewHTTP.getQueryMap(RequestViewHTTP.java:306) ~[ApacheJMeter_http.jar:5.5]
    at org.apache.jmeter.protocol.http.visualizers.RequestViewHTTP.setSamplerResult(RequestViewHTTP.java:216) ~[ApacheJMeter_http.jar:5.5]
    at org.apache.jmeter.visualizers.RequestPanel.setSamplerResult(RequestPanel.java:116) ~[ApacheJMeter_components.jar:5.5]
    at org.apache.jmeter.visualizers.SamplerResultTab.setupTabPane(SamplerResultTab.java:256) ~[ApacheJMeter_components.jar:5.5]
    at org.apache.jmeter.visualizers.ViewResultsFullVisualizer.valueChanged(ViewResultsFullVisualizer.java:395) ~[ApacheJMeter_components.jar:5.5]
    at org.apache.jmeter.visualizers.ViewResultsFullVisualizer.valueChanged(ViewResultsFullVisualizer.java:373) ~[ApacheJMeter_components.jar:5.5]
    at javax.swing.JTree.fireValueChanged(Unknown Source) ~[?:1.8.0_301]
    at javax.swing.JTree$TreeSelectionRedirector.valueChanged(Unknown Source) ~[?:1.8.0_301]
    at javax.swing.tree.DefaultTreeSelectionModel.fireValueChanged(Unknown Source) ~[?:1.8.0_301]
    at javax.swing.tree.DefaultTreeSelectionModel.notifyPathChange(Unknown Source) ~[?:1.8.0_301]
    at javax.swing.tree.DefaultTreeSelectionModel.setSelectionPaths(Unknown Source) ~[?:1.8.0_301]
    at javax.swing.tree.DefaultTreeSelectionModel.setSelectionPath(Unknown Source) ~[?:1.8.0_301]
    at javax.swing.JTree.setSelectionPath(Unknown Source) ~[?:1.8.0_301]
    at javax.swing.plaf.basic.BasicTreeUI.selectPathForEvent(Unknown Source) ~[?:1.8.0_301]
    at javax.swing.plaf.basic.BasicTreeUI$Handler.handleSelection(Unknown Source) ~[?:1.8.0_301]
    at javax.swing.plaf.basic.BasicTreeUI$Handler.mousePressed(Unknown Source) ~[?:1.8.0_301]
    at java.awt.AWTEventMulticaster.mousePressed(Unknown Source) ~[?:1.8.0_301]
    at java.awt.Component.processMouseEvent(Unknown Source) ~[?:1.8.0_301]
    at javax.swing.JComponent.processMouseEvent(Unknown Source) ~[?:1.8.0_301]
    at java.awt.Component.processEvent(Unknown Source) ~[?:1.8.0_301]
    at java.awt.Container.processEvent(Unknown Source) ~[?:1.8.0_301]
    at java.awt.Component.dispatchEventImpl(Unknown Source) ~[?:1.8.0_301]
    at java.awt.Container.dispatchEventImpl(Unknown Source) ~[?:1.8.0_301]
    at java.awt.Component.dispatchEvent(Unknown Source) ~[?:1.8.0_301]
    at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source) ~[?:1.8.0_301]
    at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source) ~[?:1.8.0_301]
    at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source) ~[?:1.8.0_301]
    at java.awt.Container.dispatchEventImpl(Unknown Source) ~[?:1.8.0_301]
    at java.awt.Window.dispatchEventImpl(Unknown Source) ~[?:1.8.0_301]
    at java.awt.Component.dispatchEvent(Unknown Source) ~[?:1.8.0_301]
    at java.awt.EventQueue.dispatchEventImpl(Unknown Source) ~[?:1.8.0_301]
    at java.awt.EventQueue.access$500(Unknown Source) ~[?:1.8.0_301]
    at java.awt.EventQueue$3.run(Unknown Source) ~[?:1.8.0_301]
    at java.awt.EventQueue$3.run(Unknown Source) ~[?:1.8.0_301]
    at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_301]
    at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source) ~[?:1.8.0_301]
    at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source) ~[?:1.8.0_301]
    at java.awt.EventQueue$4.run(Unknown Source) ~[?:1.8.0_301]
    at java.awt.EventQueue$4.run(Unknown Source) ~[?:1.8.0_301]
    at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_301]
    at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source) ~[?:1.8.0_301]
    at java.awt.EventQueue.dispatchEvent(Unknown Source) ~[?:1.8.0_301]
    at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) ~[?:1.8.0_301]
    at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source) ~[?:1.8.0_301]
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) ~[?:1.8.0_301]
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source) ~[?:1.8.0_301]
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source) ~[?:1.8.0_301]
    at java.awt.EventDispatchThread.run(Unknown Source) ~[?:1.8.0_301]

解决方法 #

• 关闭查看结果树组件后再运行测试：该错误是JMeter的UI解析组件触发的，并非请求本身执行失败，关闭UI组件后可正常发送请求。
• 改用CSV Data Set Config读取文件：配置Filename为myPath/test.json，Variable Names设为payload，Delimiter留空，勾选Allow quoted data，请求体中直接引用${payload}即可。
• 对JSON内容做URL编码：如果坚持用__FileToString，可嵌套编码函数：${__urlencode(${__FileToString(myPath/test.json,,)})}，注意确认服务器是否支持解码后的内容。
• 升级JMeter版本：JMeter 5.5存在大内容解析的UI组件bug，升级到5.6.x及以上版本可修复该问题。

内容的提问来源于stack exchange，提问作者BlueCode_xxx