Exception in thread "main" java.lang.UnsupportedClassVersionError: org/apache/zeppelin/server/ZeppelinServer : Unsupported major.minor version 52.0
在启动Zeppelin时遇到了该问题:
[root@quickstart bin]# ./zeppelin-daemon.sh restart Please specify HADOOP_CONF_DIR if USE_HADOOP is true ./zeppelin-daemon.sh: line 268: /opt/soft/Programs/zeppelin-0.9.0-bin-all/logs/zeppelin-root-quickstart.cloudera.out: No such file or directory Zeppelin is not running Log dir doesn't exist, create /opt/soft/Programs/zeppelin-0.9.0-bin-all/logs Pid dir doesn't exist, create /opt/soft/Programs/zeppelin-0.9.0-bin-all/run Zeppelin start [ OK ] Zeppelin process died [FAILED]
通过查看日志信息发现了如下错误:
Exception in thread "main" java.lang.UnsupportedClassVersionError: org/apache/zeppelin/server/ZeppelinServer : Unsupported major.minor version 52.0 at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:800) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) at java.net.URLClassLoader.defineClass(URLClassLoader.java:449) at java.net.URLClassLoader.access$100(URLClassLoader.java:71) at java.net.URLClassLoader$1.run(URLClassLoader.java:361) at java.net.URLClassLoader$1.run(URLClassLoader.java:355) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:354) at java.lang.ClassLoader.loadClass(ClassLoader.java:425) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) at java.lang.ClassLoader.loadClass(ClassLoader.java:358) at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:482)
以上错误一般是由于高版本编译低版本运行导致的,解决的思路第一步查看自己的Java编译版本和运行版本是否一致:
[root@quickstart logs]# java -version java version "1.7.0_67" Java(TM) SE Runtime Environment (build 1.7.0_67-b01) Java HotSpot(TM) 64-Bit Server VM (build 24.65-b04, mixed mode)
既然发现了错误,那就果断删除自带的jdk 1.7换成jdk 1.8的。
1.查看java安装路径 # which java 2.删除jdk 1.7 # rm -rf /usr/java/jdk1.7.0_67-cloudera 3.删除jdk 1.7的配置文件 # vim /etc/profile 4.确认是否删除干净 # rpm -qa|grep java # rpm -qa|grep jdk 5.下载解压jdk 1.8 # tar -zxvf jdk-8u301-linux-x64.tar.gz 6.修改配置文件 # vim /etc/profile export JAVA_HOME=/usr/java/jdk1.8.0_301
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
7.检查是否重装成功
[root@quickstart java]# source /etc/profile
[root@quickstart java]# java -version
java version "1.8.0_301"
Java(TM) SE Runtime Environment (build 1.8.0_301-b09)
Java HotSpot(TM) 64-Bit Server VM (build 25.301-b09, mixed mode)
显示重装jdk 1.8成功!
最后验证Zeppelin是否能启动成功
[root@quickstart bin]# ./zeppelin-daemon.sh start Please specify HADOOP_CONF_DIR if USE_HADOOP is true Zeppelin start [ OK ]
都没问题了!!!