如何使用System.out.println查找Java类？

Question

日志被重定向为SystemOut。 如何找到打印这些语句的Java类？

[7/11/19 10：34：41：786 EDT] 0000010b SystemOut O [2019-07-11 10：34：41,785] [WebContainer：2] DEBUG loader.Loader（getRow：1533）-结果行：

我想阻止/禁止/删除这些SystemOut语句。

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UPDATE根据dbourne的回答添加了PrintStream调用者的堆栈跟踪。

21:02:00.444 0x30004f00              mt.0        > java/io/PrintStream.println(Ljava/lang/String;)V bytecode method, this = 0x7ffa75098
21:02:00.444 0x30004f00       j9trc_aux.0        - jstacktrace:
21:02:00.444 0x30004f00       j9trc_aux.1        - [1] java.io.PrintStream.println (PrintStream.java:829)
21:02:00.444 0x30004f00       j9trc_aux.1        - [2] com.ibm.ejs.ras.hpel.HpelHelper.printHeader (HpelHelper.java:662)
21:02:00.444 0x30004f00       j9trc_aux.1        - [3] com.ibm.ejs.ras.RasHelper.printHeader (RasHelper.java:1898)
21:02:00.444 0x30004f00       j9trc_aux.1        - [4] com.ibm.ejs.ras.RasHelper.printHeader (RasHelper.java:1892)
21:02:00.444 0x30004f00       j9trc_aux.1        - [5] com.ibm.ejs.ras.SystemOutStream.replaceSystemOutStream (SystemOutStream.java:156)
21:02:00.444 0x30004f00       j9trc_aux.1        - [6] com.ibm.ws.runtime.WsServerImpl.redirectStream (WsServerImpl.java:459)
21:02:00.444 0x30004f00       j9trc_aux.1        - [7] com.ibm.ws.runtime.WsServerImpl.bootLoggingServices (WsServerImpl.java:402)
21:02:00.444 0x30004f00       j9trc_aux.1        - [8] com.ibm.ws.runtime.WsServerImpl.start (WsServerImpl.java:201)
21:02:00.444 0x30004f00       j9trc_aux.1        - [9] com.ibm.ws.runtime.WsServerImpl.main (WsServerImpl.java:697)
21:02:00.445 0x30004f00       j9trc_aux.1        - [10] com.ibm.ws.runtime.WsServer.main (WsServer.java:59)
21:02:00.445 0x30004f00       j9trc_aux.1        - [11] sun.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
21:02:00.445 0x30004f00       j9trc_aux.1        - [12] sun.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:90)
21:02:00.445 0x30004f00       j9trc_aux.1        - [13] sun.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:55) (Compiled Code)
21:02:00.445 0x30004f00       j9trc_aux.1        - [14] java.lang.reflect.Method.invoke (Method.java:508) (Compiled Code)
21:02:00.445 0x30004f00       j9trc_aux.1        - [15] com.ibm.wsspi.bootstrap.WSLauncher.launchMain (WSLauncher.java:234)
21:02:00.445 0x30004f00       j9trc_aux.1        - [16] com.ibm.wsspi.bootstrap.WSLauncher.main (WSLauncher.java:101)
21:02:00.445 0x30004f00       j9trc_aux.1        - [17] com.ibm.wsspi.bootstrap.WSLauncher.run (WSLauncher.java:82)
21:02:00.445 0x30004f00       j9trc_aux.1        - [18] sun.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
21:02:00.445 0x30004f00       j9trc_aux.1        - [19] sun.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:90)
21:02:00.445 0x30004f00       j9trc_aux.1        - [20] sun.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:55) (Compiled Code)
21:02:00.445 0x30004f00       j9trc_aux.1        - [21] java.lang.reflect.Method.invoke (Method.java:508) (Compiled Code)
21:02:00.445 0x30004f00       j9trc_aux.1        - [22] org.eclipse.equinox.internal.app.EclipseAppContainer.callMethodWithException (EclipseAppContainer.java:587)
21:02:00.445 0x30004f00       j9trc_aux.1        - [23] org.eclipse.equinox.internal.app.EclipseAppHandle.run (EclipseAppHandle.java:198)
21:02:00.445 0x30004f00       j9trc_aux.1        - [24] org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication (EclipseAppLauncher.java:110)
21:02:00.445 0x30004f00       j9trc_aux.1        - [25] org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start (EclipseAppLauncher.java:79)
21:02:00.445 0x30004f00       j9trc_aux.1        - [26] org.eclipse.core.runtime.adaptor.EclipseStarter.run (EclipseStarter.java:354)
21:02:00.445 0x30004f00       j9trc_aux.1        - [27] org.eclipse.core.runtime.adaptor.EclipseStarter.run (EclipseStarter.java:181)
21:02:00.445 0x30004f00       j9trc_aux.1        - [28] sun.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
21:02:00.445 0x30004f00       j9trc_aux.1        - [29] sun.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:90)
21:02:00.445 0x30004f00       j9trc_aux.1        - [30] sun.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:55)
21:02:00.445 0x30004f00       j9trc_aux.1        - [31] java.lang.reflect.Method.invoke (Method.java:508)
21:02:00.445 0x30004f00       j9trc_aux.1        - [32] org.eclipse.core.launcher.Main.invokeFramework (Main.java:340)
21:02:00.445 0x30004f00       j9trc_aux.1        - [33] org.eclipse.core.launcher.Main.basicRun (Main.java:282)
21:02:00.445 0x30004f00       j9trc_aux.1        - [34] org.eclipse.core.launcher.Main.run (Main.java:981)
21:02:00.445 0x30004f00       j9trc_aux.1        - [35] com.ibm.wsspi.bootstrap.WSPreLauncher.launchEclipse (WSPreLauncher.java:413)
21:02:00.445 0x30004f00       j9trc_aux.1        - [36] com.ibm.wsspi.bootstrap.WSPreLauncher.main (WSPreLauncher.java:174)
21:02:00.446 0x30004f00              mt.6        < java/io/PrintStream.println(Ljava/lang/String;)V bytecode method
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02:09:27.893 0x33dd3000              mt.1        > java/io/PrintStream.println(Ljava/lang/String;)V compiled method, this = 0x700d16a70
02:09:27.893 0x33dd3000       j9trc_aux.0        - jstacktrace:
02:09:27.893 0x33dd3000       j9trc_aux.1        - [1] java.io.PrintStream.println (PrintStream.java:829) (Compiled Code)
02:09:27.893 0x33dd3000       j9trc_aux.1        - [2] com.ibm.ejs.ras.SystemStream.writeWebSphereEvent (SystemStream.java:738) (Compiled Code)
02:09:27.893 0x33dd3000       j9trc_aux.1        - [3] com.ibm.ejs.ras.SystemOutStream.logMessage (SystemOutStream.java:330) (Compiled Code)
02:09:27.894 0x33dd3000       j9trc_aux.1        - [4] com.ibm.ejs.ras.SystemOutStream.processEvent (SystemOutStream.java:319) (Compiled Code)
02:09:27.894 0x33dd3000       j9trc_aux.1        - [5] com.ibm.ws.logging.WsHandlerWrapper.publish (WsHandlerWrapper.java:43)
02:09:27.894 0x33dd3000       j9trc_aux.1        - [6] java.util.logging.Logger.log (Logger.java:749) (Compiled Code)
02:09:27.894 0x33dd3000       j9trc_aux.1        - [7] com.ibm.ws.logging.WsLogger.deliverOrBuffer (WsLogger.java:416)
02:09:27.894 0x33dd3000       j9trc_aux.1        - [8] com.ibm.ws.logging.WsLogger.log (WsLogger.java:394)
02:09:27.894 0x33dd3000       j9trc_aux.1        - [9] com.ibm.ws.logging.WsLogger.logp (WsLogger.java:599) (Compiled Code)
02:09:27.894 0x33dd3000       j9trc_aux.1        - [10] org.apache.commons.logging.impl.Jdk14Logger.log (Jdk14Logger.java:126)
02:09:27.894 0x33dd3000       j9trc_aux.1        - [11] org.apache.commons.logging.impl.Jdk14Logger.info (Jdk14Logger.java:193)
02:09:27.894 0x33dd3000       j9trc_aux.1        - [12] org.springframework.context.support.AbstractApplicationContext.initMessageSource (AbstractApplicationContext.java:473)
02:09:27.894 0x33dd3000       j9trc_aux.1        - [13] org.springframework.context.support.AbstractApplicationContext.refresh (AbstractApplicationContext.java:334)
02:09:27.894 0x33dd3000       j9trc_aux.1        - [14] org.springframework.context.support.ClassPathXmlApplicationContext.<init> (ClassPathXmlApplicationContext.java:92)
02:09:27.894 0x33dd3000       j9trc_aux.1        - [15] org.springframework.context.support.ClassPathXmlApplicationContext.<init> (ClassPathXmlApplicationContext.java:77)
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Answer 1

如果您有源代码，我建议在整个源代码树中使用类似grep "System.out"的名称。

另一种方法可能是编写PrintStream的实现，该实现在每次调用时都将堆栈跟踪信息转储到控制台。 然后编写一个包装器类，在调用程序的主类的main()之前，将该新PrintStream的实例设置为out （ System.setOut( new MyPrintStream( System.out ) ) ）。

您可以通过以下方式实现MyPrintStream ，使其仅打印一次调用者，并且仅打印包含out.print*()语句的行。 但是，您必须确保该程序将执行所有分支，以确保将打印所有位置。

Answer 2

IBM JDK提供了一种跟踪工具，您可以使用它来查找谁正在调用任何方法。 要查找谁在调用System.out.println，请将以下内容添加到您的genericJvmArguments中，然后重新启动服务器。 输出将显示调用方的堆栈跟踪，该输出应显示在native_stdout.log文件中。

-Xtrace:print=mt,trigger=method{java/io/PrintStream.println,jstacktrace}

带有上面的JVM参数集的示例应用程序的堆栈跟踪的片段，调用System.out.println（），标识了Hello.printHello（Hello.java:15）写入System.out。

03:41:01.245*0x3277900 mt.0 > java/io/PrintStream.println(Ljava/lang/String;)V Bytecode method, This = 7fffff49f98
03:41:01.247 0x3277900 j9trc_aux.0 - jstacktrace:
03:41:01.248 0x3277900 j9trc_aux.1 - [1] java.io.PrintStream.println (PrintStream.java:829)
03:41:01.248 0x3277900 j9trc_aux.1 - [2] com.ibm.jvm.io.ConsolePrintStream.println (ConsolePrintStream.java:311)
03:41:01.250 0x3277900 j9trc_aux.1 - [3] Hello.printHello (Hello.java:15)
03:41:01.251 0x3277900 j9trc_aux.1 - [4] Hello.main (Hello.java:9)Hello World
03:41:01.253 0x3277900 mt.6 < java/io/PrintStream.println(Ljava/lang/String;)V Bytecode method