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...

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
Only CommonClass.java

java-dynamic-loader-jar1

1. ChildCommonClass1.java extend CommonClass.java
2. ClassJar1.java contains CommonClass field

java-dynamic-loader-jar2

1. ChildCommonClass2.java extend CommonClass.java
2. ClassJar2.java contains CommonClass field

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 may solved it, but I have not try.

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

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