使用arthas出现异常：com.taobao.arthas.core.command.express.ExpressException: java.lang.NullPointerException: target is null for method getBean

[Uncle-Xi]

• 我已经在 issues 里搜索，没有重复的issue。

环境信息

• arthas-boot.jar 或者 as.sh 的版本： 4.0.2、3.4.3、3.6.9、3.5.5 都一样的结果
• Arthas 版本: 4.0.2、3.4.3、3.6.9、3.5.5
• 操作系统版本: windows 11
• 目标进程的JVM版本: 1.8
• 执行arthas-boot的版本: 4.0.2、3.4.3、3.6.9、3.5.5

重现问题的步骤

1、pom导入依赖

com.taobao.arthas
arthas-tunnel-server
4.0.2


com.taobao.arthas
arthas-spring-boot-starter
4.0.2

2、yml配置了
spring:
arthas:
enabled: true
arthas:
ip: 0.0.0.0

3、在控台执行命令就报错（arthas idea plugin 拷贝的命令 —— 命令本身没问题）

http://localhost:8563/

期望的结果

What do you expected from the above steps？

正常执行命令

实际运行的结果

实际运行结果，最好有详细的日志，异常栈。尽量贴文本。

2024-11-10 22:06:49 [arthas-command-execute] WARN  c.t.a.c.command.klass100.OgnlCommand -ognl: failed execute express: #[email protected]@context,#springContext.getBean("authMetadataService").permissionOptions()
com.taobao.arthas.core.command.express.ExpressException: java.lang.NullPointerException: target is null for method getBean
	at com.taobao.arthas.core.command.express.OgnlExpress.get(OgnlExpress.java:39)
	at com.taobao.arthas.core.command.klass100.OgnlCommand.process(OgnlCommand.java:106)
	at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl.process(AnnotatedCommandImpl.java:82)
	at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl.access$100(AnnotatedCommandImpl.java:18)
	at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl$ProcessHandler.handle(AnnotatedCommandImpl.java:111)
	at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl$ProcessHandler.handle(AnnotatedCommandImpl.java:108)
	at com.taobao.arthas.core.shell.system.impl.ProcessImpl$CommandProcessTask.run(ProcessImpl.java:385)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run$$$capture(FutureTask.java:266)
	at java.util.concurrent.FutureTask.run(FutureTask.java)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.NullPointerException: target is null for method getBean
	at ognl.OgnlRuntime.callMethod(OgnlRuntime.java:1620)
	at ognl.ASTMethod.getValueBody(ASTMethod.java:72)
	at ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:171)
	at ognl.SimpleNode.getValue(SimpleNode.java:206)
	at ognl.ASTChain.getValueBody(ASTChain.java:128)
	at ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:171)
	at ognl.SimpleNode.getValue(SimpleNode.java:206)
	at ognl.ASTSequence.getValueBody(ASTSequence.java:47)
	at ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:171)
	at ognl.SimpleNode.getValue(SimpleNode.java:206)
	at ognl.Ognl.getValue(Ognl.java:408)
	at ognl.Ognl.getValue(Ognl.java:480)
	at ognl.Ognl.getValue(Ognl.java:460)
	at com.taobao.arthas.core.command.express.OgnlExpress.get(OgnlExpress.java:36)
	... 14 common frames omitted

[WangJi92]

hello， 我这里也测试了一下 ，你可能需要携带 -c classloader hashcode ，Caused by: java.lang.NullPointerException: target is null for method getBean ，获取静态的spring context 为null

@Uncle-Xi

[arthas@22736]$ ognl -x 3 '#springContext=@com.wangji92.arthas.plugin.demo.common.ApplicationContextProvider@context,#springContext.getBean("commonController").innerAnonymousClass()'
Failed to execute ognl, exception message: java.lang.NullPointerException: target is null for method getBean, please check $HOME/logs/arthas/arthas.log for more details.
[arthas@22736]$ ognl -x 3 '#springContext=@com.wangji92.arthas.plugin.demo.common.ApplicationContextProvider@context,#springContext.getBean("commonController").innerAnonymousClass()' -c 17c2f048
@String[ok]

[WangJi92]

不过推荐你换个命令 ，这个命令更加灵活 https://arthas.aliyun.com/doc/vmtool.html ，不需要配置spring context ，任何项目都可以

[Uncle-Xi]

好的，多谢 多谢 xizongren ***@***.***  

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