java - JobOperator 无法实例化

Question

当我尝试运行此代码以执行批处理作业时:

JobOperator jo = BatchRuntime.getJobOperator();
Properties props = new Properties();
long jobId = jo.start("tweetimport", props);

我一直收到错误。当我试图从 servlet 运行它时，出现了这个错误:

Severe:   Could not instantiate service: com.ibm.jbatch.container.impl.BatchKernelImpl due to exception:java.lang.reflect.InvocationTargetException
Warning:   StandardWrapperValve[KwetterServlet]: Servlet.service() for servlet KwetterServlet threw exception
java.util.ServiceConfigurationError: javax.batch.operations.JobOperator: Provider com.ibm.jbatch.container.api.impl.JobOperatorImpl could not be instantiated

当我从一个普通的 java 类运行它时，我得到了这个错误:

mrt 21, 2016 10:19:08 AM javax.batch.runtime.BatchRuntime getJobOperator
WARNING: The ServiceLoader was unable to find an implementation for JobOperator. Check classpath for META-INF/services/javax.batch.operations.JobOperator file.
Exception in thread "main" java.lang.NullPointerException

我在其他来源 > src/main/resources > META-INF.batch-jobs 中有这个 tweetimport.xml 文件

<job id="tweetimport" xmlns="http://xmlns.jcp.org/xml/ns/javaee" version="1.0">
<properties>
    <property name="input_file" value="/KwetterBackend/kwetter-input.json"/>
</properties>
<step id="process">
    <chunk item-count="100">
        <reader ref="TweetReader"></reader>
        <processor ref="TweetProcessor"></processor>
        <writer ref="TweetWriter"></writer>
    </chunk>
</step>

我不明白为什么会出现此错误。 The link to my project

Answer 1

我已经找到了答案，我必须启动这个程序:glassfish-4.1\bin\asadmin，然后执行这一行:

set-batch-runtime-configuration --datasourcelookupname nameofyourJDBCdatasource

现在它工作正常。