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...

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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

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

java-dynamic-loader-jar2

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

java-dynamic-loader-host

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

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.

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