当我运行命令$ nodetool help
时,出现以下错误;
java.lang.NullPointerException at org.apache.cassandra.config.DatabaseDescriptor.getDiskFailurePolicy(DatabaseDescriptor.java:1877) at org.apache.cassandra.utils.JVMStabilityInspector.inspectThrowable(JVMStabilityInspector.java:62) at org.apache.cassandra.io.util.FileUtils.<clinit>(FileUtils.java:79) at org.apache.cassandra.utils.FBUtilities.getToolsOutputDirectory(FBUtilities.java:807) at org.apache.cassandra.tools.NodeTool.printHistory(NodeTool.java:199) at org.apache.cassandra.tools.NodeTool.main(NodeTool.java:167)
请让我知道是否有任何提示。
我也遇到了同样的错误,但是可以通过明确指定配置来解决此问题:
JAVA_HOME="/opt/java/my-java"
PATH="$JAVA_HOME/bin:$PATH"
# run the node tool
CASSANDRA_CONF=/path/tocassandra/conf.d \
JAVA_TOOL_OPTIONS= \
JAVA_HOME=/opt/java/my-java \
./bin/nodetool status
HTH
我有同样的错误。
[我建议您也使用Java 7或8(未经测试的7),而不是Java 9或10。
$ java -version # java 8
java version "1.8.0_144"
Java(TM) SE Runtime Environment (build 1.8.0_144-b01)
Java HotSpot(TM) 64-Bit Server VM (build 25.144-b01, mixed mode)
$ java --version # java 9
java 9.0.4
Java(TM) SE Runtime Environment (build 9.0.4+11)
Java HotSpot(TM) 64-Bit Server VM (build 9.0.4+11, mixed mode)
$ nodetool # java 9
error: null
-- StackTrace --
java.lang.NullPointerException
at org.apache.cassandra.config.DatabaseDescriptor.getDiskFailurePolicy(DatabaseDescriptor.java:1881)
at org.apache.cassandra.utils.JVMStabilityInspector.inspectThrowable(JVMStabilityInspector.java:82)
at org.apache.cassandra.io.util.FileUtils.<clinit>(FileUtils.java:79)
at org.apache.cassandra.utils.FBUtilities.getToolsOutputDirectory(FBUtilities.java:788)
at org.apache.cassandra.tools.NodeTool.printHistory(NodeTool.java:200)
at org.apache.cassandra.tools.NodeTool.main(NodeTool.java:168)
我假设cassandra代码尝试在某处解析Java版本,并且不处理最新的Java版本
如果要运行帮助命令,请移至Cassandra的bin目录,然后运行以下命令-
./nodetool help
我可以通过降级默认的Java版本在Ubuntu 18.4上解决它:
sudo update-alternatives --config java
输出应类似于:
Selection Path Priority Status
------------------------------------------------------------
0 /usr/lib/jvm/java-11-openjdk-amd64/bin/java 1111 auto mode
1 /usr/lib/jvm/java-11-openjdk-amd64/bin/java 1111 manual mode
* 2 /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java 1081 manual mode
现在只需选择Java版本8。您可以尝试使用java -version
进行所有操作。