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jvm diagnose tool by swapping bytecode

Home Page: https://www.xiaogenban1993.com/blog/24.07/arthas%E5%86%8D%E8%A7%81swapper%E4%BD%A0%E5%A5%BD

License: MIT License

Java 89.71% HTML 0.33% C 0.81% Go 9.15%

bytecode hotswap jvm debugging-tool attach javassist diagnose asm

jvmbyteswaptool's Introduction

JVM ByteSwap Tool

A tool that can hot swap the class byte code while jvm is running. Very suitable for SpringBoot framework.

Based on the jvm instrumentation tech, ASM, javassist and JVMTI.

Usage

Download the zip file from the release page.

Make sure you have a JDK >= 1.8.

$ java -jar swapper.jar

// All of the java processes will be listed in following
// Choose the pid you want to attach
// Then a web ui will be served at http://localhost:8000

Visit this url http://localhost:8000 then you will get the following Web UI.

Now you can enjoy the functionalities of swapper tool.

For example, Watch some methods. Trigger this method, and then the params and return value and execution time cost will be printed.

It's Watch one of the functions provided by swapper tool.

Get more functions and details from the wiki.

jvmbyteswaptool's People

Contributors

Stargazers

Watchers

Forkers

huangyuntao wuwenrui sunms1024 nb216ers hx0088 wuou-learn biluping wl2027 yuyao52769

jvmbyteswaptool's Issues

TypeNotPresentException

When computeAllFrames, there is a method in ClassWriter getCommonSuperClass, that will return the common super type of given types. Here, use current classloader to load the given type. It should be Global.getClassLoader

java.lang.TypeNotPresentException: Type XXXXX not present
	at wshade.org.objectweb.asm.ClassWriter.getCommonSuperClass(ClassWriter.java:1052)
	at wshade.org.objectweb.asm.SymbolTable.addMergedType(SymbolTable.java:1264)
	at wshade.org.objectweb.asm.Frame.merge(Frame.java:1311)
	at wshade.org.objectweb.asm.Frame.merge(Frame.java:1255)
	at wshade.org.objectweb.asm.MethodWriter.computeAllFrames(MethodWriter.java:1612)
	at wshade.org.objectweb.asm.MethodWriter.visitMaxs(MethodWriter.java:1548)
	at wshade.org.objectweb.asm.MethodVisitor.visitMaxs(MethodVisitor.java:786)
	at wshade.org.objectweb.asm.commons.LocalVariablesSorter.visitMaxs(LocalVariablesSorter.java:147)
	at w.core.model.WatchTransformer$1$1.visitMaxs(WatchTransformer.java:114)
	at wshade.org.objectweb.asm.ClassReader.readCode(ClassReader.java:2664)
	at wshade.org.objectweb.asm.ClassReader.readMethod(ClassReader.java:1512)
	at wshade.org.objectweb.asm.ClassReader.accept(ClassReader.java:745)
	at wshade.org.objectweb.asm.ClassReader.accept(ClassReader.java:425)
	at w.core.model.WatchTransformer.transform(WatchTransformer.java:52)
	at w.core.model.BaseClassTransformer.transform(BaseClassTransformer.java:48)
	at sun.instrument.TransformerManager.transform(TransformerManager.java:188)
	at sun.instrument.InstrumentationImpl.transform(InstrumentationImpl.java:428)
	at sun.instrument.InstrumentationImpl.retransformClasses0(Native Method)
	at sun.instrument.InstrumentationImpl.retransformClasses(InstrumentationImpl.java:144)
	at w.Global.addActiveTransformer(Global.java:256)
	at w.core.Swapper.swap(Swapper.java:68)
	at w.web.Websocketd$1.dispatch(Websocketd.java:98)
	at w.web.Websocketd$1.onMessage(Websocketd.java:51)
	at fi.iki.elonen.NanoWSD$WebSocket.handleWebsocketFrame(NanoWSD.java:229)
	at fi.iki.elonen.NanoWSD$WebSocket.readWebsocket(NanoWSD.java:247)
	at fi.iki.elonen.NanoWSD$WebSocket.access$200(NanoWSD.java:65)
	at fi.iki.elonen.NanoWSD$WebSocket$1.send(NanoWSD.java:88)
	at fi.iki.elonen.NanoHTTPD$HTTPSession.execute(NanoHTTPD.java:852)
	at fi.iki.elonen.NanoHTTPD$ClientHandler.run(NanoHTTPD.java:189)
	at java.lang.Thread.run(Thread.java:750)
Caused by: java.lang.ClassNotFoundException: XXXXX
	at java.net.URLClassLoader.findClass(URLClassLoader.java:387)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:352)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:348)
	at wshade.org.objectweb.asm.ClassWriter.getCommonSuperClass(ClassWriter.java:1050)
	... 29 more

Use current jdk compiler in exec instead of javassist compiler

More details

readme
test cases
ci by github actions

Groovy classloader conflict

If the target project also use groovy lib, the groovy script interpreter will crash

TODO list

日志信息整理，增加日志等级，并可以在前端过滤显示哪些信息。
接口和抽象类不支持，目前会直接报错，改为提前校验并提示，可能的子类型。
- 考虑打印提示信息，这是个接口无法直接增强，你可能增强的子类列表，然后标注哪个类是springBean
考虑增加trace功能，打印函数内的每个调用其他函数的耗时。

下面ognl #root是springctx，用来过滤实现了某个接口的对象，的真实类名。

#root.getBeanDefinitionNames().{ #name=#this, #b=#root.getBean(#name), #b instanceof com.xxx.MyInterface ? #b : null}.{? #this != null}.{#this.class}

TUI support

Add tui for some situations that the web or network cannot connected directly.

工具类启动显示WindowsAttachProvider不能被初始化

按照b站教程，先启动了一个自定义的web的jar，然后启动swapper，但是java.util.ServiceConfigurationError: com.sun.tools.attach.spi.AttachProvider: Provider sun.tools.attach.WindowsAttachProvider could not be instantiated，目录也没有显示任何在运行的java进程，不知道咋回事。（还有另外一个问题我想要请教一下，我的电脑的java.home设置的就是C:\Program Files\Java\jdk-1.8\jre，但是一启动swapper，java.home就会自动变成 C:\Program Files\Java\jre-1.8,导致启动报错，我只能去修改swapper的源代码了。）

sunwu51 / jvmbyteswaptool Goto Github PK

jvmbyteswaptool's Introduction

JVM ByteSwap Tool

Usage

jvmbyteswaptool's People

Contributors

Stargazers

Watchers

Forkers

jvmbyteswaptool's Issues

TypeNotPresentException

Use current jdk compiler in exec instead of javassist compiler

More details

Groovy classloader conflict

TODO list

TUI support

工具类启动显示WindowsAttachProvider不能被初始化

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