Java Agent疑问

Question

Java Agent疑问

发布于
2019-09-22

更新于
2019-09-22

今天看了一篇博客，Java 调式、热部署、JVM 背后的支持者 Java Agent
照着步骤尝试，遇到的问题是：
（1） JVM 启动参数 -javaagent:xxx.jar 的形式运行的时候，在intellij中是OK的；但是在命令行中运行就不行，只出来这样的结果：

但是在intellij中运行，是可以出来完整的

命令行运行的命令如下:

javac PersonTest.java 
java -javaagent:/Users/name/github/java/java_agent_demo/build/libs/java_agent_demo-1.0-SNAPSHOT.jar PersonTest

其中 java_agent_demo-1.0-SNAPSHOT.jar是用gradle生成的 ./gradlew clean build -x test

同样的jar，一个是在intellij IDE中运行的，可以出来想要的效果，一个是在命令行运行的，却没有得到想要的结果。实在不知道原因在哪里。另外，从上面的两张截图可以看到，intellij加载的类，是多于纯命令行的加载类。以下是intellij中执行的结果中的语句

/Library/Java/JavaVirtualMachines/jdk1.8.0_181.jdk/Contents/Home/bin/java -javaagent:/Users/yangxiaohuan/my_private/github/my_public/java/java_agent_demo/build/libs/java_agent_demo-1.0-SNAPSHOT.jar "-javaagent:/Applications/IntelliJ IDEA.app/Contents/lib/idea_rt.jar=49943:/Applications/IntelliJ IDEA.app/Contents/bin" -Dfile.encoding=UTF-8 -classpath /Library/Java/JavaVirtualMachines/jdk1.8.0_181.jdk/Contents/Home/jre/lib/charsets.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_181.jdk/Contents/Home/jre/lib/deploy.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_181.jdk/Contents/Home/jre/lib/ext/cldrdata.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_181.jdk/Contents/Home/jre/lib/ext/dnsns.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_181.jdk/Contents/Home/jre/lib/ext/jaccess.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_181.jdk/Contents/Home/jre/lib/ext/jfxrt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_181.jdk/Contents/Home/jre/lib/ext/localedata.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_181.jdk/Contents/Home/jre/lib/ext/nashorn.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_181.jdk/Contents/Home/jre/lib/ext/sunec.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_181.jdk/Contents/Home/jre/lib/ext/sunjce_provider.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_181.jdk/Contents/Home/jre/lib/ext/sunpkcs11.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_181.jdk/Contents/Home/jre/lib/ext/zipfs.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_181.jdk/Contents/Home/jre/lib/javaws.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_181.jdk/Contents/Home/jre/lib/jce.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_181.jdk/Contents/Home/jre/lib/jfr.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_181.jdk/Contents/Home/jre/lib/jfxswt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_181.jdk/Contents/Home/jre/lib/jsse.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_181.jdk/Contents/Home/jre/lib/management-agent.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_181.jdk/Contents/Home/jre/lib/plugin.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_181.jdk/Contents/Home/jre/lib/resources.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_181.jdk/Contents/Home/jre/lib/rt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_181.jdk/Contents/Home/lib/ant-javafx.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_181.jdk/Contents/Home/lib/dt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_181.jdk/Contents/Home/lib/javafx-mx.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_181.jdk/Contents/Home/lib/jconsole.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_181.jdk/Contents/Home/lib/packager.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_181.jdk/Contents/Home/lib/sa-jdi.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_181.jdk/Contents/Home/lib/tools.jar:/Users/yangxiaohuan/my_private/github/my_public/java/java_agent_demo/out/test/classes:/Users/yangxiaohuan/my_private/github/my_public/java/java_agent_demo/out/production/classes:/Users/yangxiaohuan/.gradle/caches/modules-2/files-2.1/org.javassist/javassist/3.25.0-GA/442dc1f9fd520130bd18da938622f4f9b2e5fba3/javassist-3.25.0-GA.jar:/Users/yangxiaohuan/.gradle/caches/modules-2/files-2.1/junit/junit/4.12/2973d150c0dc1fefe998f834810d68f278ea58ec/junit-4.12.jar:/Users/yangxiaohuan/.gradle/caches/modules-2/files-2.1/org.hamcrest/hamcrest-core/1.3/42a25dc3219429f0e5d060061f71acb49bf010a0/hamcrest-core-1.3.jar PersonTest
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[J
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正在加载类：PersonTest
----
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javassist.CtClassType@6f539caf[changed public class PersonTest fields= constructors=javassist.CtConstructor@49097b5d[public PersonTest ()V],  methods=javassist.CtMethod@44a4fe33[public static main ([Ljava/lang/String;)V], ]
javassist.NotFoundException: test(..) is not found in PersonTest
    at javassist.CtClassType.getDeclaredMethod(CtClassType.java:1343)
    at com.agent.MyTransformer.transform(MyTransformer.java:38)
    at sun.instrument.TransformerManager.transform(TransformerManager.java:188)
    at sun.instrument.InstrumentationImpl.transform(InstrumentationImpl.java:428)
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
    at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:495)
正在加载类：sun/launcher/LauncherHelper$FXHelper
****
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按数字键 1 调用测试方法
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1
正在加载类：Person
----
javassist.CtClassType@4d405ef7[changed public class Person fields= constructors=javassist.CtConstructor@6193b845[public Person ()V],  methods=javassist.CtMethod@cbb76d13[public test ()Ljava/lang/String;], ]
获取方法名称：test
 动态插入的打印语句 
执行测试方法
I'm ok

可以看到 java/util/regex/Pattern$Prolog 这之后的加载的类，在命令行是没有打印出来的。为什么intellij 和纯命令行的结果差别这么大呢？

而且这里有一个报错

javassist.CtClassType@6f539caf[changed public class PersonTest fields= constructors=javassist.CtConstructor@49097b5d[public PersonTest ()V],  methods=javassist.CtMethod@44a4fe33[public static main ([Ljava/lang/String;)V], ]
javassist.NotFoundException: test(..) is not found in PersonTest
    at javassist.CtClassType.getDeclaredMethod(CtClassType.java:1343)
    at com.agent.MyTransformer.transform(MyTransformer.java:38)

（2）以动态 attach 的方式运行

也是在命令行中运行的，结果也是跟上面类似

命令如下：

java PersonTest



javac -classpath /Library/Java/JavaVirtualMachines/jdk1.8.0_181.jdk/Contents/Home/lib/tools.jar:. AttachAgent.java

java -classpath /Library/Java/JavaVirtualMachines/jdk1.8.0_181.jdk/Contents/Home/lib/tools.jar:. AttachAgent

java8

java

阅读 4.4k

1 个回答

yang9527

✓ 已被采纳

最终在原文博主的帮助下，确定了问题所在：我使用gradle方式生成的jar包，只有3KB大小，没有将所需要的依赖javassist包含进去。修改gradle，使得可以将javassist包含进去，然后就没有出现这种问题了。
另外，在-javaagent方式运行的时候，出现这种报错：

正在加载类：PersonTest
javassist.NotFoundException: test(..) is not found in PersonTest
    at javassist.CtClassType.getDeclaredMethod(CtClassType.java:1186)
    at kite.lab.custom.agent.MyTransformer.transform(MyTransformer.java:36)
    at sun.instrument.TransformerManager.transform(TransformerManager.java:188)
    at sun.instrument.InstrumentationImpl.transform(InstrumentationImpl.java:428)
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
    at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:495)

以attach方式没有这种报错，是因为我改变了它的写法。

if(!className.toLowerCase().contains("person")){
  System.out.println("****");
  return classfileBuffer;
}

当运行PersonTest时候，所以会报错。在Attach方式时候，由于类名中不包含“person”，所以没有问题。

主要原因还是因为gradle不熟悉，打包的结果中，没有包含依赖包。

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