mazheng0908/jarboot

By mazheng0908

•Updated about 1 year ago

A powerful Java process starter that manage monitor and debug a series of Java instance online.

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mazheng0908/jarboot repository overview

⁠Jarboot ❤️

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Jarboot is a platform for Java process startup, debugging and diagnosis，which can manage, monitor and debug a series of Java instance.

In the test environment and daily built integrated environment, a series of jar files such as compilation output can be put into the agreed directory. Jarboot provides a friendly browser UI interface and HTTP interface to manage its start, stop and status monitoring, and execute commands to debug the target process.

中文说明/Chinese Documentation⁠

📚 Document: https://www.yuque.com/jarboot/usage/quick-start⁠

😊 Advanced application examples: Jarboot 🔥 with Spring Cloud Alibaba Examples ⤵️

🍏 The Example url: https://github.com/majianzheng/jarboot-with-spring-cloud-alibaba-example⁠ ⭐️

🐳 Extensible: Support both JDK SPI and Spring SPI, support plugins develop.

overview

⁠Background and objectives

Jarboot uses Java agent and ASM technology to inject code into the target java process, which is non-invasive. The injected code is only used for command interaction with jarboot's service. Some commands modify the bytecode of the class for class enhancement. A command system similar to Arthas is added, such as acquiring JVM information, monitoring thread status, acquiring thread stack information, etc.

🌈 Browser interface management, one click start, stop, do not have to manually execute one by one.
🔥 Support start and stop priority configuration^[1]⁠, and default parallel start.
⭐ Process daemon. If the service exits abnormally after opening, it will be automatically started and notified.
☀️ Support file update monitoring, and restart automatically if jar file is updated after opening.^[2]⁠
🚀 Debug command execution, remote debugging multiple Java processes at the same time, the interface is more friendly.
💎 Support user-define command by SPI, support develop plugins.

Front-end interface adopts React technology, scaffold uses UmiJs, component library uses UmiJs built-in antd. The back-end service is mainly implemented by SpringBoot, which provides HTTP interface and static resource broker. The process information is pushed through websocket to the front-end interface in real time, and a long connection is maintained with the started java process to monitor its status.

⁠Architecture brief introduction view⁠.

⁠Install or build

⁠Download the zip package to install or using docker.

Download from Github⁠
🐳 Docker Hub: https://registry.hub.docker.com/r/mazheng0908/jarboot⁠

Use docker

sudo docker run -itd --name jarboot-test -p 9899:9899 mazheng0908/jarboot

⁠Code build method

Ignore this when using zip package or docker.

Build the jarboot code.

#At first build ui
$ cd jarboot-ui
#First time, execute yarn or npm install
$ yarn

#execute compile, yarn build or npm run build, execute yarn start or npm run start at development mode.
$ yarn build

#Switch to the code root directory and compile the Java code
$ cd ../
$ mvn clean install

⁠Start `jarboot` server

Ignore this when using docker.

#Execute startup.sh to start, use startup.cmd when in windows OS.
$ sh startup.sh

⁠Browser access http://127.0.0.1:9899⁠

Enter the login page. Initial username: jarboot, default password: jarboot

⁠SPI Extension, support both JDK and Spring SPI

Use SPI extension can implement your own command, define a command how to execute. And，also can notify stated event to Jarboot server , don't need to wait no console time.

⁠SpringBoot Application

Import spring-boot-starter-jarboot dependency

<dependency>
    <groupId>io.github.majianzheng</groupId>
    <artifactId>spring-boot-starter-jarboot</artifactId>
    <version>1.1.1</version>
</dependency>

Implement CommandProcessorSPI interface

Also, you can use @Bean in the method.
It will use bean name as the command name if not annotated by @Name.

@Name("spring.command.name")
@Summary("The command summary")
@Description("The command usage detail")
@Component
public class DemoServiceImpl implements DemoService, CommandProcessor {
  @Override
  public String process(CommandSession session, String[] args) {
      return "Spring boot Demo user-defined command using Spring SPI";
  }
  //implement other method...
}

It will add two new spring debug command spring.bean and spring.env after imported spring-boot-starter-jarboot dependence.

#spring.bean usage:
$ spring.bean [-b <name>] [-d]
#Examples:
# Get all bean names
$ spring.bean
# Get bean info
$ spring.bean -b beanName
# Get bean detail definition
$ spring.bean -b beanName -d

#sping.env usage:
$ spring.env <name>
#Examples:
$ spring.env spring.application.name

⁠None SpringBoot Application

Demonstrate how to use ordinary non springboot applications.

⁠How to create user-defined command

Import jarboot api dependency

<dependency>
    <groupId>io.github.majianzheng</groupId>
    <artifactId>jarboot-api</artifactId>
    <scope>provided</scope>
    <version>1.1.1</version>
</dependency>

Implement spi interface

/**
 * Use Name to define the command name
 */
@Name("demo")
@Summary("The command summary")
@Description("The command usage detail")
public class DemoCommandProcessor implements CommandProcessor {
    @Override
    public String process(CommandSession session, String[] args) {
        return "demo SPI command result.";
    }
}

Create spi define file

Then create a file in resources/META-INF/services named com.mz.jarboot.api.cmd.spi.CommandProcessor the content is class full name.

⁠Proactive notification of startup completion

public class DemoApplication {
    public static void main(String[] args) {
        // do something
        try {
            //Notify completion
            JarbootFactory.createAgentService().setStarted();
        } catch (Exception e) {
            log(e.getMessage());
        }
    }
}

⁠Command list

⁠bytes

View the class bytes，Usage：

jarboot$ bytes com.mz.jarboot.demo.DemoServerApplication
ClassLoader: org.springframework.boot.loader.LaunchedURLClassLoader@31221be2
------
getUser
L0
LINENUMBER 27 L0

...

ILOAD 1
ILOAD 2
IADD
IRETURN
L8

⁠stdout

Turn on or off real-time display of standard output stream (initially on), it will be displayed on the front-end UI of the web in real time. The output stream includes System.out.println, System.err.println and log printing information such as logger.info("hello") in the code.

Note: The implementation mechanism of this function has been carefully designed. It is recommended to be turned on all the time, which has no impact on performance and can be accelerated when starting.

#Turn on real time display of standard output stream
jarboot$ stdout on

#Turn off real time display of standard output stream
jarboot$ stdout off

#Get current status on or off
jarboot$ stdout

⁠dashboard

This is the real time statistics dashboard for the current system，click x cancel.

dashboard

⁠jad

Decompile the specified classes.

jarboot$ jad [-c] java.lang.String

jad

⁠jvm

Check the current JVM’s info

jarboot$ jvm

⁠sc

Search any loaded class with detailed information.

$ sc -d org.springframework.web.context.support.XmlWebApplicationContext
 class-info        org.springframework.web.context.support.XmlWebApplicationContext
 code-source       /Users/xxx/work/test/WEB-INF/lib/spring-web-3.2.11.RELEASE.jar
 name              org.springframework.web.context.support.XmlWebApplicationContext
 isInterface       false
 isAnnotation      false
 isEnum            false
 isAnonymousClass  false
 isArray           false
 isLocalClass      false
 isMemberClass     false
 isPrimitive       false
 isSynthetic       false
 simple-name       XmlWebApplicationContext
 modifier          public
 annotation
 interfaces
 super-class       +-org.springframework.web.context.support.AbstractRefreshableWebApplicationContext
                     +-org.springframework.context.support.AbstractRefreshableConfigApplicationContext
                       +-org.springframework.context.support.AbstractRefreshableApplicationContext
                         +-org.springframework.context.support.AbstractApplicationContext
                           +-org.springframework.core.io.DefaultResourceLoader
                             +-java.lang.Object
 class-loader      +-org.apache.catalina.loader.ParallelWebappClassLoader
                     +-java.net.URLClassLoader@6108b2d7
                       +-sun.misc.Launcher$AppClassLoader@18b4aac2
                         +-sun.misc.Launcher$ExtClassLoader@1ddf84b8
 classLoaderHash   25131501

⁠trace

method calling path, and output the time cost for each node in the path.

jarboot$ trace com.mz.jarboot.demo.DemoServerApplication add 
Affect(class count: 2 , method count: 1) cost in 63 ms, listenerId: 2
`---ts=2021-06-15 23:34:20;thread_name=http-nio-9900-exec-3;id=13;is_daemon=true;priority=5;TCCL=org.springframework.boot.web.embedded.tomcat.TomcatEmbeddedWebappClassLoader@4690b489
    `---[0.053485ms] com.mz.jarboot.demo.DemoServerApplication:add()

⁠watch

methods in data aspect including return values, exceptions and parameters

Watch the first parameter and thrown exception of com.mz.jarboot.demo.DemoServerApplicatio#add only if it throws exception.

jarboot$ watch com.mz.jarboot.demo.DemoServerApplicatio add {params[0], throwExp} -e
Press x to abort.
Affect(class-cnt:1 , method-cnt:1) cost in 65 ms.
ts=2018-09-18 10:26:28;result=@ArrayList[
    @RequestFacade[org.apache.catalina.connector.RequestFacade@79f922b2],
    @NullPointerException[java.lang.NullPointerException],
]

⁠thread

Check the basic info and stack trace of the target thread.

jarboot$ thread -n 3
"nioEventLoopGroup-2-1" Id=31 cpuUsage=0.37% deltaTime=0ms time=880ms RUNNABLE
    at sun.management.ThreadImpl.dumpThreads0(Native Method)
    at sun.management.ThreadImpl.getThreadInfo(ThreadImpl.java:448)
    at com.mz.jarboot.core.cmd.impl.ThreadCommand.processTopBusyThreads(ThreadCommand.java:209)
    at com.mz.jarboot.core.cmd.impl.ThreadCommand.run(ThreadCommand.java:120)
    at com.mz.jarboot.core.basic.EnvironmentContext.runCommand(EnvironmentContext.java:162)
    at com.mz.jarboot.core.cmd.CommandDispatcher.execute(CommandDispatcher.java:35)
    at com.mz.jarboot.core.server.JarbootBootstrap$1.onText(JarbootBootstrap.java:94)
    at com.mz.jarboot.core.ws.WebSocketClientHandler.channelRead0(WebSocketClientHandler.java:83)
    at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:99)

"C2 CompilerThread1" [Internal] cpuUsage=3.14% deltaTime=6ms time=4599ms


"C2 CompilerThread0" [Internal] cpuUsage=2.28% deltaTime=4ms time=4692ms

⁠Classloader

View the class loader extends tree, url and class loader info.

jarboot$ classloader
name	                                                numberOfInstances	loadedCountTotal
org.springframework.boot.loader.LaunchedURLClassLoader	1	                3929
BootstrapClassLoader	                                1                	2623
com.mz.jarboot.agent.JarbootClassLoader             	1               	1780
sun.misc.Launcher$AppClassLoader                    	1               	59
sun.reflect.DelegatingClassLoader                 	58                	58
sun.misc.Launcher$ExtClassLoader                     	1	                18
Affect(row-cnt:6) cost in 35 ms.

⁠heapdump

dump java heap in hprof binary format, like jmap.

jarboot$ heapdump

heap dump

⁠sysprop

Examine the system properties from the target JVM

#Get all.
jarboot$ sysprop
#Get one property.
jarboot$ sysprop user.home

⁠Credit

⁠Projects

bytekit⁠ Java Bytecode Kit.
Arthas⁠ Some command is developed on the source of Arthas.

⁠仓库镜像

码云Jarboot⁠

1: You can configure the priority level, starting from the integer value of 1. The more you start first, the reverse is the order of stop.
2: In development, it can be built automatically by tools such as gitlab runner, Jenkins, etc. and copied to the directory specified by Jarboot through script. Updates monitored by Jarboot will restart the service automatically. Directory monitoring implements anti-shake design (multiple updates within a certain period of time will trigger only one restart).

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