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BAEL-1728: add java instrumentation

This commit is contained in:
Adi 2018-07-22 00:11:46 +03:00 committed by José Carlos Valero Sánchez
parent 2fec9da2d5
commit ecb14dd834
9 changed files with 365 additions and 0 deletions
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120
core-java/pom.xml
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@ -173,6 +173,19 @@
<artifactId>c3p0</artifactId> <artifactId>c3p0</artifactId>
<version>${c3p0.version}</version> <version>${c3p0.version}</version>
</dependency> </dependency>
<!-- instrumentation -->
<dependency>
<groupId>org.javassist</groupId>
<artifactId>javassist</artifactId>
<version>${javaassist.version}</version>
</dependency>
<dependency>
<groupId>com.sun</groupId>
<artifactId>tools</artifactId>
<version>1.8.0</version>
<scope>system</scope>
<systemPath>${java.home}/../lib/tools.jar</systemPath>
</dependency>
</dependencies> </dependencies>
<build> <build>
@ -400,6 +413,111 @@
</plugins> </plugins>
</build> </build>
</profile> </profile>
<!-- java instrumentation profiles to build jars -->
<profile>
<id>buildAgentLoader</id>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>jar</goal>
</goals>
<configuration>
<classifier>agentLoader</classifier>
<classesDirectory>target/classes</classesDirectory>
<archive>
<manifest>
<addClasspath>true</addClasspath>
</manifest>
<manifestFile>${project.build.outputDirectory}/META-INF/MANIFEST.MF</manifestFile>
</archive>
<includes>
<include>com/baeldung/instrumentation/application/AgentLoader.class</include>
<include>com/baeldung/instrumentation/application/Launcher.class</include>
</includes>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</profile>
<profile>
<id>buildApplication</id>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>jar</goal>
</goals>
<configuration>
<classifier>application</classifier>
<classesDirectory>target/classes</classesDirectory>
<archive>
<manifest>
<addClasspath>true</addClasspath>
</manifest>
<manifestFile>${project.build.outputDirectory}/META-INF/MANIFEST.MF</manifestFile>
</archive>
<includes>
<include>com/baeldung/instrumentation/application/MyAtm.class</include>
<include>com/baeldung/instrumentation/application/MyAtmApplication.class</include>
<include>com/baeldung/instrumentation/application/Launcher.class</include>
</includes>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</profile>
<profile>
<id>buildAgent</id>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>jar</goal>
</goals>
<configuration>
<classifier>agent</classifier>
<classesDirectory>target/classes</classesDirectory>
<archive>
<manifest>
<addClasspath>true</addClasspath>
</manifest>
<manifestFile>${project.build.outputDirectory}/META-INF/MANIFEST.MF</manifestFile>
</archive>
<includes>
<include>com/baeldung/instrumentation/agent/AtmTransformer.class</include>
<include>com/baeldung/instrumentation/agent/MyInstrumentationAgent.class</include>
</includes>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</profile>
</profiles> </profiles>
<properties> <properties>
@ -453,6 +571,8 @@
<!-- Mime Type Libraries --> <!-- Mime Type Libraries -->
<tika.version>1.18</tika.version> <tika.version>1.18</tika.version>
<jmime-magic.version>0.1.5</jmime-magic.version> <jmime-magic.version>0.1.5</jmime-magic.version>
<!-- instrumentation -->
<javaassist.version>3.21.0-GA</javaassist.version>
</properties> </properties>
</project> </project>

70
core-java/src/main/java/com/baeldung/instrumentation/agent/AtmTransformer.java Normal file
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@ -0,0 +1,70 @@
package com.baeldung.instrumentation.agent;
import javassist.CannotCompileException;
import javassist.ClassPool;
import javassist.CtClass;
import javassist.CtMethod;
import javassist.NotFoundException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
import java.lang.instrument.ClassFileTransformer;
import java.lang.instrument.IllegalClassFormatException;
import java.security.ProtectionDomain;
public class AtmTransformer implements ClassFileTransformer {
private static Logger LOGGER = LoggerFactory.getLogger(AtmTransformer.class);
private static final String WITHDRAW_MONEY_METHOD = "withdrawMoney";
/** The internal form class name of the class to transform */
private String targetClassName;
/** The class loader of the class we want to transform */
private ClassLoader targetClassLoader;
public AtmTransformer(String targetClassName, ClassLoader targetClassLoader) {
this.targetClassName = targetClassName;
this.targetClassLoader = targetClassLoader;
}
@Override
public byte[] transform(ClassLoader loader, String className, Class<?> classBeingRedefined,
ProtectionDomain protectionDomain, byte[] classfileBuffer) throws IllegalClassFormatException {
byte[] byteCode = classfileBuffer;
String finalTargetClassName = this.targetClassName.replaceAll("\\.", "/"); //replace . with /
if (!className.equals(finalTargetClassName)) {
return byteCode;
}
if (className.equals(finalTargetClassName) && loader.equals(targetClassLoader)) {
LOGGER.info("[Agent] Transforming class MyAtm");
try {
ClassPool cp = ClassPool.getDefault();
CtClass cc = cp.get(targetClassName);
CtMethod m = cc.getDeclaredMethod(WITHDRAW_MONEY_METHOD);
m.addLocalVariable("startTime", CtClass.longType);
m.insertBefore("startTime = System.currentTimeMillis();");
StringBuilder endBlock = new StringBuilder();
m.addLocalVariable("endTime", CtClass.longType);
m.addLocalVariable("opTime", CtClass.longType);
endBlock.append("endTime = System.currentTimeMillis();");
endBlock.append("opTime = (endTime-startTime)/1000;");
endBlock.append("LOGGER.info(\"[Application] Withdrawal operation completed in:\" + opTime + \" seconds!\");");
m.insertAfter(endBlock.toString());
byteCode = cc.toBytecode();
cc.detach();
} catch (NotFoundException | CannotCompileException | IOException e) {
LOGGER.error("Exception", e);
}
}
return byteCode;
}
}

59
core-java/src/main/java/com/baeldung/instrumentation/agent/MyInstrumentationAgent.java Normal file
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@ -0,0 +1,59 @@
package com.baeldung.instrumentation.agent;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.lang.instrument.Instrumentation;
public class MyInstrumentationAgent {
private static Logger LOGGER = LoggerFactory.getLogger(MyInstrumentationAgent.class);
public static void premain(String agentArgs, Instrumentation inst) {
LOGGER.info("[Agent] In premain method");
String className = "com.baeldung.instrumentation.application.MyAtm";
transformClass(className,inst);
}
public static void agentmain(String agentArgs, Instrumentation inst) {
LOGGER.info("[Agent] In agentmain method");
String className = "com.baeldung.instrumentation.application.MyAtm";
transformClass(className,inst);
}
private static void transformClass(String className, Instrumentation instrumentation) {
Class<?> targetCls = null;
ClassLoader targetClassLoader = null;
// see if we can get the class using forName
try {
targetCls = Class.forName(className);
targetClassLoader = targetCls.getClassLoader();
transform(targetCls, targetClassLoader, instrumentation);
return;
} catch (Exception ex) {
LOGGER.error("Class [{}] not found with Class.forName");
}
// otherwise iterate all loaded classes and find what we want
for(Class<?> clazz: instrumentation.getAllLoadedClasses()) {
if(clazz.getName().equals(className)) {
targetCls = clazz;
targetClassLoader = targetCls.getClassLoader();
transform(targetCls, targetClassLoader, instrumentation);
return;
}
}
throw new RuntimeException("Failed to find class [" + className + "]");
}
private static void transform(Class<?> clazz, ClassLoader classLoader, Instrumentation instrumentation) {
AtmTransformer dt = new AtmTransformer(clazz.getName(), classLoader);
instrumentation.addTransformer(dt, true);
try {
instrumentation.retransformClasses(clazz);
} catch (Exception ex) {
throw new RuntimeException("Transform failed for class: [" + clazz.getName() + "]", ex);
}
}
}

46
core-java/src/main/java/com/baeldung/instrumentation/application/AgentLoader.java Normal file
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@ -0,0 +1,46 @@
package com.baeldung.instrumentation.application;
import com.sun.tools.attach.VirtualMachine;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.File;
import java.util.Optional;
/**
* Created by adi on 6/10/18.
*/
public class AgentLoader {
private static Logger LOGGER = LoggerFactory.getLogger(AgentLoader.class);
public static void run(String[] args) {
String agentFilePath = "/home/adi/Desktop/agent-1.0.0-jar-with-dependencies.jar";
String applicationName = "MyAtmApplication";
//iterate all jvms and get the first one that matches our application name
Optional<String> jvmProcessOpt = Optional.ofNullable(VirtualMachine.list()
.stream()
.filter(jvm -> {
LOGGER.info("jvm:{}", jvm.displayName());
return jvm.displayName().contains(applicationName);
})
.findFirst().get().id());
if(!jvmProcessOpt.isPresent()) {
LOGGER.error("Target Application not found");
return;
}
File agentFile = new File(agentFilePath);
try {
String jvmPid = jvmProcessOpt.get();
LOGGER.info("Attaching to target JVM with PID: " + jvmPid);
VirtualMachine jvm = VirtualMachine.attach(jvmPid);
jvm.loadAgent(agentFile.getAbsolutePath());
jvm.detach();
LOGGER.info("Attached to target JVM and loaded Java agent successfully");
} catch (Exception e) {
throw new RuntimeException(e);
}
}
}

14
core-java/src/main/java/com/baeldung/instrumentation/application/Launcher.java Normal file
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@ -0,0 +1,14 @@
package com.baeldung.instrumentation.application;
/**
* Created by adi on 6/14/18.
*/
public class Launcher {
public static void main(String[] args) throws Exception {
if(args[0].equals("StartMyAtmApplication")) {
new MyAtmApplication().run(args);
} else if(args[0].equals("LoadAgent")) {
new AgentLoader().run(args);
}
}
}

19
core-java/src/main/java/com/baeldung/instrumentation/application/MyAtm.java Normal file
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@ -0,0 +1,19 @@
package com.baeldung.instrumentation.application;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Created by adi on 6/11/18.
*/
public class MyAtm {
private static Logger LOGGER = LoggerFactory.getLogger(MyAtm.class);
private static final int account = 10;
public static void withdrawMoney(int amount) throws InterruptedException {
Thread.sleep(2000l); //processing going on here
LOGGER.info("[Application] Successful Withdrawal of [{}] units!", amount);
}
}

19
core-java/src/main/java/com/baeldung/instrumentation/application/MyAtmApplication.java Normal file
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@ -0,0 +1,19 @@
package com.baeldung.instrumentation.application;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class MyAtmApplication {
private static Logger LOGGER = LoggerFactory.getLogger(MyAtmApplication.class);
public static void run(String[] args) throws Exception {
LOGGER.info("[Application] Starting ATM application");
MyAtm.withdrawMoney(Integer.parseInt(args[2]));
Thread.sleep(Long.valueOf(args[1]));
MyAtm.withdrawMoney(Integer.parseInt(args[3]));
}
}

5
core-java/src/main/resources/META-INF/MANIFEST.MF Normal file
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@ -0,0 +1,5 @@
Agent-Class: com.baeldung.instrumentation.agent.MyInstrumentationAgent
Can-Redefine-Classes: true
Can-Retransform-Classes: true
Premain-Class: com.baeldung.instrumentation.agent.MyInstrumentationAgent
Main-Class: com.baeldung.instrumentation.application.Launcher

13
core-java/src/main/resources/log4j2.xml Normal file
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@ -0,0 +1,13 @@
<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="WARN">
<Appenders>
<Console name="Console" target="SYSTEM_OUT">
<PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level - %msg%n"/>
</Console>
</Appenders>
<Loggers>
<Root level="debug">
<AppenderRef ref="Console"/>
</Root>
</Loggers>
</Configuration>