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120 lines
2.9 KiB
Plaintext
120 lines
2.9 KiB
Plaintext
jad
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===
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> Decompile the specified classes.
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`jad` helps to decompile the byte code running in JVM to the source code to assist you to understand the logic behind better.
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* The decompiled code is syntax highlighted for better readability in Arthas console.
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* It is possible that there's grammar error in the decompiled code, but it should not affect your interpretation.
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### Options
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|Name|Specification|
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|---:|:---|
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|*class-pattern*|pattern for the class name|
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|`[c:]`|hashcode of the class loader that loads the class|
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|`[E]`|turn on regex match while the default is wildcard match|
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### Usage
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#### Decompile `java.lang.String`
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```java
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$ jad java.lang.String
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ClassLoader:
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Location:
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/*
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* Decompiled with CFR 0_132.
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*/
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package java.lang;
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import java.io.ObjectStreamField;
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...
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public final class String
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implements Serializable,
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Comparable<String>,
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CharSequence {
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private final char[] value;
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private int hash;
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private static final long serialVersionUID = -6849794470754667710L;
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private static final ObjectStreamField[] serialPersistentFields = new ObjectStreamField[0];
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public static final Comparator<String> CASE_INSENSITIVE_ORDER = new CaseInsensitiveComparator();
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public String(byte[] arrby, int n, int n2) {
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String.checkBounds(arrby, n, n2);
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this.value = StringCoding.decode(arrby, n, n2);
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}
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...
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```
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#### Decompile the specified method
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```java
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$ jad demo.MathGame main
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ClassLoader:
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+-sun.misc.Launcher$AppClassLoader@3d4eac69
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+-sun.misc.Launcher$ExtClassLoader@66350f69
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Location:
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/private/tmp/arthas-demo.jar
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public static void main(String[] args) throws InterruptedException {
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MathGame game = new MathGame();
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do {
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game.run();
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TimeUnit.SECONDS.sleep(1L);
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} while (true);
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}
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Affect(row-cnt:1) cost in 228 ms.
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```
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#### Decompile with specified classLoader
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> If the target class is loaded by multiple classloaders, `jad` outputs the `hashcode` of the corresponding classloaders, then you can re-run `jad` and specify `-c <hashcode>` to decompile the target class from the specified classloader.
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```java
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$ jad org.apache.log4j.Logger
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Found more than one class for: org.apache.log4j.Logger, Please use jad -c hashcode org.apache.log4j.Logger
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HASHCODE CLASSLOADER
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69dcaba4 +-monitor's ModuleClassLoader
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6e51ad67 +-java.net.URLClassLoader@6e51ad67
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+-sun.misc.Launcher$AppClassLoader@6951a712
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+-sun.misc.Launcher$ExtClassLoader@6fafc4c2
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2bdd9114 +-pandora-qos-service's ModuleClassLoader
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4c0df5f8 +-pandora-framework's ModuleClassLoader
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Affect(row-cnt:0) cost in 38 ms.
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$ jad org.apache.log4j.Logger -c 69dcaba4
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ClassLoader:
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+-monitor's ModuleClassLoader
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Location:
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/Users/admin/app/log4j-1.2.14.jar
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package org.apache.log4j;
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import org.apache.log4j.spi.*;
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public class Logger extends Category
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{
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private static final String FQCN;
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protected Logger(String name)
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{
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super(name);
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}
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...
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Affect(row-cnt:1) cost in 190 ms.
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```
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