jad¶

反编译指定已加载类的源码

jad 命令将 JVM 中实际运行的 class 的 byte code 反编译成 java 代码，便于你理解业务逻辑；

在 Arthas Console 上，反编译出来的源码是带语法高亮的，阅读更方便
当然，反编译出来的 java 代码可能会存在语法错误，但不影响你进行阅读理解

参数说明¶

参数名称	参数说明
class-pattern	类名表达式匹配
`[c:]`	类所属 ClassLoader 的 hashcode
[E]	开启正则表达式匹配，默认为通配符匹配

使用参考¶

编绎`java.lang.String`¶

$ jad java.lang.String

ClassLoader:

Location:

/*
* Decompiled with CFR 0_132.
*/
package java.lang;

import java.io.ObjectStreamField;
...
public final class String
implements Serializable,
Comparable<String>,
CharSequence {
    private final char[] value;
    private int hash;
    private static final long serialVersionUID = -6849794470754667710L;
    private static final ObjectStreamField[] serialPersistentFields = new ObjectStreamField[0];
    public static final Comparator<String> CASE_INSENSITIVE_ORDER = new CaseInsensitiveComparator();

    public String(byte[] arrby, int n, int n2) {
        String.checkBounds(arrby, n, n2);
        this.value = StringCoding.decode(arrby, n, n2);
    }
...

反编绎指定的函数¶

$ jad demo.MathGame main

ClassLoader:
+-sun.misc.Launcher$AppClassLoader@3d4eac69
+-sun.misc.Launcher$ExtClassLoader@66350f69

Location:
/private/tmp/arthas-demo.jar

public static void main(String[] args) throws InterruptedException {
    MathGame game = new MathGame();
    do {
        game.run();
        TimeUnit.SECONDS.sleep(1L);
    } while (true);
}

Affect(row-cnt:1) cost in 228 ms.

反编绎时指定ClassLoader¶

当有多个 ClassLoader 都加载了这个类时，jad 命令会输出对应 ClassLoader 实例的 hashcode，然后你只需要重新执行 jad 命令，并使用参数 -c 就可以反编译指定 ClassLoader 加载的那个类了；

$ jad org.apache.log4j.Logger

Found more than one class for: org.apache.log4j.Logger, Please use jad -c hashcode org.apache.log4j.Logger
HASHCODE  CLASSLOADER
69dcaba4  +-monitor's ModuleClassLoader
6e51ad67  +-java.net.URLClassLoader@6e51ad67
            +-sun.misc.Launcher$AppClassLoader@6951a712
            +-sun.misc.Launcher$ExtClassLoader@6fafc4c2
2bdd9114  +-pandora-qos-service's ModuleClassLoader
4c0df5f8  +-pandora-framework's ModuleClassLoader

Affect(row-cnt:0) cost in 38 ms.
$ jad org.apache.log4j.Logger -c 69dcaba4

ClassLoader:
+-monitor's ModuleClassLoader

Location:
/Users/admin/app/log4j-1.2.14.jar

package org.apache.log4j;

import org.apache.log4j.spi.*;

public class Logger extends Category
{
    private static final String FQCN;

    protected Logger(String name)
    {
        super(name);
    }

...

Affect(row-cnt:1) cost in 190 ms.

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