maven 依赖辩论非常分析

非常如下

1. Description:
3. An attempt was made to call a method that does not exist. The attempt was made from the following location:
5.     com.google.common.cache.CacheBuilder.initialCapacity(CacheBuilder.java:353)
7. The following method did not exist:
9.     com.google.common.base.Preconditions.checkState(ZLjava/lang/String;I)V
11. The calling method's class, com.google.common.cache.CacheBuilder, was loaded from the following location:
13.     jar:file:/Users/Zhuanz/Documents/software/apache-maven-3.8.1/maven-repository/com/google/guava/guava/30.1-jre/guava-30.1-jre.jar!/com/google/common/cache/CacheBuilder.class
15. The called method's class, com.google.common.base.Preconditions, is available from the following locations:
17.     jar:file:/Users/Zhuanz/Documents/software/apache-maven-3.8.1/maven-repository/com/google/collections/google-collections/1.0/google-collections-1.0.jar!/com/google/common/base/Preconditions.class
18.     jar:file:/Users/Zhuanz/Documents/software/apache-maven-3.8.1/maven-repository/com/google/guava/guava/30.1-jre/guava-30.1-jre.jar!/com/google/common/base/Preconditions.class
20. The called method's class hierarchy was loaded from the following locations:
22.     com.google.common.base.Preconditions: file:/Users/Zhuanz/Documents/software/apache-maven-3.8.1/maven-repository/com/google/collections/google-collections/1.0/google-collections-1.0.jar
25. Action:
27. Correct the classpath of your application so that it contains compatible versions of the classes com.google.common.cache.CacheBuilder and com.google.common.base.Preconditions

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非常栈分析

1. com.google.common.cache.CacheBuilder.initialCapacity方法调用com.google.common.base.Preconditions.checkState
3. com.google.common.cache.CacheBuilder.initialCapacity来自于/Users/Zhuanz/Documents/software/apache-maven-3.8.1/maven-repository/com/google/guava/guava/30.1-jre/guava-30.1-jre.jar
5. com.google.common.base.Preconditions.checkState方法来自于/Users/Zhuanz/Documents/software/apache-maven-3.8.1/maven-repository/com/google/collections/google-collections/1.0/google-collections-1.0.jar
6. 分析过程
7. 1、打印 classloader 发现类加载器一样
8. 2、mvn:dependency 得到如下截图，由于 google-collections 比 guava 层级高，因此会加在google-collections jar 包中的Preconditions类
9. 3、查看两个 jar 包中的字节码
10. javap -v -classpath guava-30.1-jre.jar com.google.common.base.Preconditions | grep -A 10 "checkState"
11. javap -v -classpath google-collections-1.0.jar com.google.common.base.Preconditions | grep -A 10 "checkState"
12. 对比发现com.google.common.base.Preconditions类中的 checkState 方法没有com.google.common.base.Preconditions.checkState(ZLjava/lang/String;I)V

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办理办法：去除 google-collection 的依赖即可。

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