Question

尝试运行一个非常简单的单词计数示例，但在提交作业时获取以下空指针：

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

这是我的工作属性文件：

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

java.lang.NullPointerException是由于job.properties文件中的错误造成的。

您是否已将工作流XML放入HDFS？此外，您应指定：

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

Answer 2

想补充一下这个问题的答案。

当oozie客户端遇到NullPointerException时，这通常意味着请求导致服务器线程失败。如果您想找出“真实”的原因，您应该查看服务器日志，例如/var/log/oozie/oozie.log以获取CDH。

在那里你会找到详细的堆栈跟踪。事实证明这非常有帮助。至少在我们的例子中，它确切地告诉了发生了什么，例如“一个hdfs工作流文件不存在，等等......”

提交作业时Oozie空指针异常

2 个答案: