使用janusgraph后端HBase时发现MasterNotRunning的java NoClassDef
我正在使用janusgraph和存储后端HBase。目前我正在尝试向数据库添加顶点。代码的一部分是
public class Graph {
private static JanusGraph graph = JanusGraphFactory.open("conf/jg.properties");
public static JanusGraph getGraph() {
return graph;
}
public static void addVertex() {
for (int i=0; i<5; i++) {
graph.addVertex("test", i);
}
graph.tx().commit();
}
}
使用主函数调用
Graph.addVertex();
错误是
Exception in thread "main" java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.eclipse.jdt.internal.jarinjarloader.JarRsrcLoader.main(JarRsrcLoader.java:58)
Caused by: java.lang.NoClassDefFoundError: org/apache/hadoop/hbase/MasterNotRunningException
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:264)
at org.janusgraph.util.system.ConfigurationUtil.instantiate(ConfigurationUtil.java:56)
at org.janusgraph.diskstorage.Backend.getImplementationClass(Backend.java:477)
at org.janusgraph.diskstorage.Backend.getStorageManager(Backend.java:409)
at org.janusgraph.graphdb.configuration.GraphDatabaseConfiguration.<init>(GraphDatabaseConfiguration.java:1376)
at org.janusgraph.core.JanusGraphFactory.open(JanusGraphFactory.java:164)
at org.janusgraph.core.JanusGraphFactory.open(JanusGraphFactory.java:133)
at org.janusgraph.core.JanusGraphFactory.open(JanusGraphFactory.java:80)
... 5 more
Caused by: java.lang.ClassNotFoundException: org.apache.hadoop.hbase.MasterNotRunningException
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 16 more
我正在maven0.2.0
中使用janusgraph 0.2.0
以及hbase 1.2.0、java 1.8
我在jg.properties
中设置了storage-hostname=127.0.0.1
,所以这是一个依赖项错误吗?确切地说MasterNotRunning
在哪里
# 1 楼答案
我已经找到了解决办法,但仍然很好奇
我搜索类
MasterNotRunning
,发现它在包org.apache.hadoop.hbase
中,最后猜测将org.apache.hbase & hbase-client
添加到依赖项中。错误消失了但是,我仍然找不到这个错误的原因。如果依赖项jar中的某些代码使用类
MasterNotRunning
,那么它应该导入hbase-client
jar,那么它应该已经在依赖项中了。这段代码如何通过编译并最终在运行时引发异常只需添加,我使用导出->;运行jar文件以获取我的jar,因此所有依赖项都应该添加到其中