Cassandra nodetool java.lang.NullPointerException

时间:2018-01-10 18:30:33

标签: cassandra nullpointerexception nodetool

当我运行命令$ nodetool help时,我收到以下错误;

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)

如果有人有任何提示,请告诉我。

4 个答案:

答案 0 :(得分:1)

我有同样的错误。

我建议你也使用java 7或8(未测试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版本而不处理最新的java版本

答案 1 :(得分:1)

我遇到了同样的错误,但是您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

答案 2 :(得分:0)

如果要运行help命令,请转到Cassandra的bin目录,然后运行以下命令 -

./nodetool help

答案 3 :(得分:0)

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

输出应如下所示:

  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。