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https://github.com/trinea/java-dynamic-load-jar

solve class loader isolation problem when load same classes in different jar
https://github.com/trinea/java-dynamic-load-jar

Last synced: 11 days ago
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solve class loader isolation problem when load same classes in different jar

Host: GitHub
URL: https://github.com/trinea/java-dynamic-load-jar
Owner: Trinea
License: apache-2.0
Created: 2014-06-10T16:09:58.000Z (over 10 years ago)
Default Branch: master
Last Pushed: 2020-02-16T13:50:49.000Z (over 4 years ago)
Last Synced: 2023-11-07T21:25:54.617Z (about 1 year ago)
Language: Java
Homepage: http://www.trinea.cn/
Size: 21.5 KB
Stars: 117
Watchers: 16
Forks: 68
Open Issues: 1
Metadata Files:
- Readme: README.md
- License: LICENSE

Awesome Lists containing this project

README

        Java Dynamic Load Jar

=====================

Solve class loader isolation problem when load same classes in different jar, but not work for android because of dalvik pre-verification failed, [cry...](https://github.com/Trinea/java-dynamic-load-jar#android "View Details")

  

### Dev Tools App

The Dev Tools App is a powerful android development tool that can help you improve efficiency greatly, It can be used to view the latest open source projects, view activity history, view manifest, decompile, color picker, extract apk or so, view app info, open or close the options in the developer options quickly, and more.  

  

You can download it from **[DevTools@Google Play](https://play.google.com/store/apps/details?id=cn.trinea.android.developertools)**.  

![](https://lh3.googleusercontent.com/ERb20Y50r3u_tZMMlqpH5cnS_MC_n366WoKvEjJyFfHz6d-EwvhaEUf7ZKAgRajboTWR=w720-h440-rw)  

![Class Diagram](https://farm4.staticflickr.com/3872/14301963930_2f0f0fe8aa_o.png)  

中文文档介绍：[Java 加载不同依赖 Jar 中的公共类](http://www.trinea.cn/android/java-loader-common-class/ ‎)  

### Introduce

[java-dynamic-loader-common](https://github.com/Trinea/java-dynamic-load-jar/tree/master/java-dynamic-loader-common)  

Only CommonClass.java  

  

[java-dynamic-loader-jar1](https://github.com/Trinea/java-dynamic-load-jar/tree/master/java-dynamic-loader-jar1)  

1. ChildCommonClass1.java extend CommonClass.java  

2. ClassJar1.java contains CommonClass field

  

[java-dynamic-loader-jar2](https://github.com/Trinea/java-dynamic-load-jar/tree/master/java-dynamic-loader-jar2)  

1. ChildCommonClass2.java extend CommonClass.java  

2. ClassJar2.java contains CommonClass field

  

[java-dynamic-loader-host](https://github.com/Trinea/java-dynamic-load-jar/tree/master/java-dynamic-loader-host)  

1. JarClassLoader.java to load jar1 and jar2, load from current ClassLoader first if class is CommonClass .  

2. HostMain.java have 3 tests  

TestA: CommonClass loaded from jar1 and jar2 are equals  

TestB: ChildCommonClass1 or ChildCommonClass2 can be reflected to CommonClass in host normaly  

TestC: ClassJar1.java or ClassJar2.java those contains CommonClass field can be reflected and running normal.

### Run

Loading projects to eclipse, run `java-dynamic-loader-host` as a Java Application

### Android

It's simple in java, but not work for TestB and TestC on android, because dalvik pre-verification failed. [This](http://stackoverflow.com/questions/15761081/custom-class-loading-fails-with-java-lang-illegalaccesserror-class-ref-in-pre-v) may solved it, but I have not try.  

```xml

17:28:36.095: E/PluginDexClassLoader(1464): support class is loading.cn.trinea.java.dynamic.load.common.CommonClass, current loader:1110431216, commmon lib loader:1108712248, clazz:1110549272

17:28:36.095: W/dalvikvm(1464): Class resolved by unexpected DEX: Lcn/trinea/java/dynamic/load/jar1/ChildCommonClass1;(0x422fd5f0):0x6838f000 ref [Lcn/trinea/java/dynamic/load/common/CommonClass;] Lcn/trinea/java/dynamic/load/common/CommonClass;(0x42159b38):0x65ae6000

17:28:36.095: W/dalvikvm(1464): (Lcn/trinea/java/dynamic/load/jar1/ChildCommonClass1; had used a different Lcn/trinea/java/dynamic/load/common/CommonClass; during pre-verification)

17:28:36.095: W/dalvikvm(1464): Unable to resolve superclass of Lcn/trinea/java/dynamic/load/jar1/ChildCommonClass1; (993)

17:28:36.095: W/dalvikvm(1464): Link of class 'Lcn/trinea/java/dynamic/load/jar1/ChildCommonClass1;' failed

17:28:36.095: W/dalvikvm(1464): threadid=1: thread exiting with uncaught exception (group=0x416fb498)

17:28:36.095: E/AndroidRuntime(1464): FATAL EXCEPTION: main

17:28:36.095: E/AndroidRuntime(1464): java.lang.IllegalAccessError: Class ref in pre-verified class resolved to unexpected implementation

17:28:36.095: E/AndroidRuntime(1464): 	at dalvik.system.DexFile.defineClass(Native Method)

17:28:36.095: E/AndroidRuntime(1464): 	at dalvik.system.DexFile.loadClassBinaryName(DexFile.java:211)

17:28:36.095: E/AndroidRuntime(1464): 	at dalvik.system.DexPathList.findClass(DexPathList.java:315)

17:28:36.095: E/AndroidRuntime(1464): 	at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:58)

17:28:36.095: E/AndroidRuntime(1464): 	at java.lang.ClassLoader.loadClass(ClassLoader.java:501)

```

## License

    Copyright 2014 trinea.cn

    Licensed under the Apache License, Version 2.0 (the "License");

    you may not use this file except in compliance with the License.

    You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software

    distributed under the License is distributed on an "AS IS" BASIS,

    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

    See the License for the specific language governing permissions and

    limitations under the License.