maven 依赖冲突异常分析

异常如下

Description:An attempt was made to call a method that does not exist. The attempt was made from the following location:com.google.common.cache.CacheBuilder.initialCapacity(CacheBuilder.java:353)The following method did not exist:com.google.common.base.Preconditions.checkState(ZLjava/lang/String;I)VThe calling method's class, com.google.common.cache.CacheBuilder, was loaded from the following location: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.classThe called method's class, com.google.common.base.Preconditions, is available from the following locations: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.classjar: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.classThe called method's class hierarchy was loaded from the following locations: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.jarAction: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

异常栈分析

com.google.common.cache.CacheBuilder.initialCapacity方法调用com.google.common.base.Preconditions.checkStatecom.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.jarcom.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
分析过程
1、打印 classloader 发现类加载器一样
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
3、查看两个 jar 包中的字节码
javap -v -classpath guava-30.1-jre.jar com.google.common.base.Preconditions | grep -A 10 "checkState"
javap -v -classpath google-collections-1.0.jar com.google.common.base.Preconditions | grep -A 10 "checkState"
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

解决办法：去除 google-collection 的依赖即可。