在Myeclipse构建的Java的Web项目里使用hadoop2.5的jar包，去连接Linux系统上的HDFS，做一个数据展示的工程，发生了一个莫名其妙的异常，信息如下：
- Exception in thread "main" java.lang.NoSuchMethodError: com.google.common.collect.MapMaker.keyEquivalence(Lcom/google/common/base/Equivalence;)Lcom/google/common/collect/MapMaker;
- at com.google.common.collect.Interners$WeakInterner.<init>(Interners.java:68)
- at com.google.common.collect.Interners$WeakInterner.<init>(Interners.java:66)
- at com.google.common.collect.Interners.newWeakInterner(Interners.java:63)
- at org.apache.hadoop.util.StringInterner.<clinit>(StringInterner.java:49)
- at org.apache.hadoop.conf.Configuration.loadResource(Configuration.java:2303)
- at org.apache.hadoop.conf.Configuration.loadResources(Configuration.java:2195)
- at org.apache.hadoop.conf.Configuration.getProps(Configuration.java:2112)
- at org.apache.hadoop.conf.Configuration.set(Configuration.java:989)
- at org.apache.hadoop.conf.Configuration.set(Configuration.java:961)
- at com.dhgate.hdfs.tools.HDFSTools.<clinit>(HDFSTools.java:22)
Exception in thread "main" java.lang.NoSuchMethodError: com.google.common.collect.MapMaker.keyEquivalence(Lcom/google/common/base/Equivalence;)Lcom/google/common/collect/MapMaker; at com.google.common.collect.Interners$WeakInterner.开始，散仙以为是guava的包有问题，然后就把guava的包给换了另外一个版本的，然后继续测试，发现依然报这个异常，然后在google上搜索查找，终于发现有个朋友在Hbase的Web项目里，也遇到了类似的异常，而原因大概是因为和项目里的JAVA EE6的Libraries包冲突，具体原因还未查明，后来尝试把JAVA EE6的包给删了，再次运行，则正常运行，或者把JAVA EE6的libraries包换成JAVA EE5的libraries也可正常通过。(Interners.java:68) at com.google.common.collect.Interners$WeakInterner. (Interners.java:66) at com.google.common.collect.Interners.newWeakInterner(Interners.java:63) at org.apache.hadoop.util.StringInterner. (StringInterner.java:49) at org.apache.hadoop.conf.Configuration.loadResource(Configuration.java:2303) at org.apache.hadoop.conf.Configuration.loadResources(Configuration.java:2195) at org.apache.hadoop.conf.Configuration.getProps(Configuration.java:2112) at org.apache.hadoop.conf.Configuration.set(Configuration.java:989) at org.apache.hadoop.conf.Configuration.set(Configuration.java:961) at com.dhgate.hdfs.tools.HDFSTools. (HDFSTools.java:22)
