提交作业时出现 Oozie 空指针异常

Question

只是尝试运行一个非常简单的字数统计示例，但在提交作业时得到以下空指针：

Oozie job -oozie=http：//localhost：11000/oozie/-config job.properties -run

[cloudera@localhost Oozie_Example]$ oozie job -oozie=http://localhost:11000/oozie/ -config job.properties -run
java.lang.RuntimeException: java.lang.NullPointerException
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1242)
    at sun.net.www.protocol.http.HttpURLConnection.getHeaderField(HttpURLConnection.java:2714)
    at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:477)
    at org.apache.oozie.client.OozieClient$JobSubmit.call(OozieClient.java:586)
    at org.apache.oozie.client.OozieClient$JobSubmit.call(OozieClient.java:561)
    at org.apache.oozie.client.OozieClient$ClientCallable.call(OozieClient.java:479)
    at org.apache.oozie.client.OozieClient.run(OozieClient.java:655)
    at org.apache.oozie.cli.OozieCLI.jobCommand(OozieCLI.java:918)
    at org.apache.oozie.cli.OozieCLI.processCommand(OozieCLI.java:579)
    at org.apache.oozie.cli.OozieCLI.run(OozieCLI.java:552)
    at org.apache.oozie.cli.OozieCLI.main(OozieCLI.java:199)
Caused by: java.lang.NullPointerException
    at java.io.ByteArrayInputStream.<init>(ByteArrayInputStream.java:106)
    at sun.misc.CharacterEncoder.encode(CharacterEncoder.java:188)
    at sun.net.www.protocol.http.NegotiateAuthentication.setHeaders(NegotiateAuthentication.java:156)
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1482)
    at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:468)
    ... 8 more
java.lang.NullPointerException

这是我的作业属性文件：

nameNode=hdfs://localhost:8020
jobTracker=localhost:8021
queueName=default

inputDir=${nameNode}/user/dev/oozie/workflow/wordcount/input/ 
outputDir=${nameNode}/user/dev/oozie/workflow/wordcount/output/
oozie.libpath=${nameNode}/user/oozie/workflow/wordcount/lib
oozie.use.system.libpath=true
user.name=dev
oozie.wf.application.path=${nameNode}/user/${user.name}/oozie/workflow/wordcount/

有什么想法吗？它发生得很早，所以我认为它与 Oozie 或 namenode 有关。

Answer 1

想补充一下这个问题的答案。

当oozie客户端得到一个NullPointerException时，这通常意味着请求导致服务器线程失败。如果你想找出"真正的"原因，你应该查看服务器日志，如/var/log/oozie/oozie.log for CDH。

在那里，您将找到详细的堆栈跟踪。事实证明，这是非常有帮助的。至少在我们的例子中，它准确地告诉发生了什么，例如"hdfs 工作流文件不存在，等等......"

Answer 2

java.lang.NullPointerException是由于

job.properties 文件中的错误。

您是否将工作流XML放入HDFS中？ 此外，您应该指定：

oozie.wf.application.path=${nameNode}/user/${user.name}/oozie/workflow/wordcount/my-workflow.xml