jBPM持久性：无法构建EntityManagerFactory [英] jBPM Persistence: Unable to build EntityManagerFactory

问题描述

我试图让我的jBPM项目持久。因此，我使用了这个教程。
起初，我导入了所有需要的附加罐子（根据网站）。
我还添加了 mysql-connector-java-5.1.20-bin.jar ，因为我想将mysql用作持久存储。

之后，我将有状态代码添加到我的项目中：

pre $知识库kbase = readKnowledgeBase名称）;
StatefulKnowledgeSession ksession = null;
JBPMHelper.startH2Server（）;
JBPMHelper.setupDataSource（）;
if（ProcessManager.sessionId == -1）{
ksession = JBPMHelper.newStatefulKnowledgeSession（kbase）;
ProcessManager.sessionId = ksession.getId（）;
}
else {
ksession = JBPMHelper.loadStatefulKnowledgeSession（
kbase，
ProcessManager.sessionId）;
}

然后我添加到 resources / META-INF 文件 jBPM.properties ：

persistence.datasource .name = jdbc / jbpm-ds

persistence.datasource.user = test

persistence.datasource.password = test

persistence.datasource.url = jdbc：mysql：// localhost：3306 / helpme

持久性.datasource.driverClassName = com.mysql.jdbc.Driver

persistence.enabled = true

persistence.persistenceunit .name = org.jbpm.persistence.jpa

persistence.persistenceunit.dialect = org.hibernate.dialect.MySQLDialect

如果我现在运行该项目，总是会出现以下异常（位于 ksession = JBPMHelper.newStatefulKnowledgeSession（kbase）; ）：

javax.persistence.PersistenceException：[PersistenceUnit：org.jbpm.persiste nce.jpa]无法构建EntityManagerFactory

引起：org.hibernate.HibernateException：找不到数据源

导致：javax.naming.NameNotFoundException：名称jdbc未在此上下文中绑定

解决方案

我为我的问题找到了解决方案。通常 JBPMHelper 直接从 jar ：

  public静态属性getProperties（）{
属性properties = new Properties（）; 
尝试{
属性
 .load（JBPMHelper.class.getResourceAsStream（/ jBPM.properties））; 
} catch（Throwable t）{
 //不做任何事，使用默认值
} 
 
返回属性; 
} 
  

我替换了加载机制，现在它正在加载 jBPM.properties 正确：

  public static Properties getProperties（）{
 Properties properties = new Properties（）; 
尝试{
 InputStream输入
 = new FileInputStream（./ resources / META-INF / jBPM.properties）; 
 properties.load（input）; 
 System.out.println（RPOP+ properties.toString（））; 
} catch（Throwable t）{
 //不做任何事，使用默认值
} 
 
返回属性; 
 
 $ / code> 

（我的答案改编自BartoszKP - 谢谢）

I am trying to make my jBPM Project persistent. Therefore I used the this tutorial. At first I imported all the additional jars needed (according to the website). I also added mysql-connector-java-5.1.20-bin.jar because I want to use mysql as persistent storage.

After that I added the "stateful" code to my project:

KnowledgeBase kbase = readKnowledgeBase(name);
StatefulKnowledgeSession ksession = null;
JBPMHelper.startH2Server();
JBPMHelper.setupDataSource();
if(ProcessManager.sessionId == -1){
    ksession = JBPMHelper.newStatefulKnowledgeSession(kbase);
    ProcessManager.sessionId = ksession.getId();
}
else {
ksession = JBPMHelper.loadStatefulKnowledgeSession(
    kbase,
    ProcessManager.sessionId);
}

Then I added to resources/META-INF the file jBPM.properties:

persistence.datasource.name=jdbc/jbpm-ds

persistence.datasource.user=test

persistence.datasource.password=test

persistence.datasource.url=jdbc:mysql://localhost:3306/helpme

persistence.datasource.driverClassName=com.mysql.jdbc.Driver

persistence.enabled=true

persistence.persistenceunit.name=org.jbpm.persistence.jpa

persistence.persistenceunit.dialect=org.hibernate.dialect.MySQLDialect

If I now run the project there is always the following exception (on ksession = JBPMHelper.newStatefulKnowledgeSession(kbase);):

javax.persistence.PersistenceException: [PersistenceUnit: org.jbpm.persistence.jpa] Unable to build EntityManagerFactory

Caused by: org.hibernate.HibernateException: Could not find datasource

Caused by: javax.naming.NameNotFoundException: Name jdbc is not bound in this Context

解决方案

I found a solution for my Problem. Normally the JBPMHelper loads the jBPM directly from the jar:

public static Properties getProperties() {
    Properties properties = new Properties();
    try {
        properties
            .load(JBPMHelper.class.getResourceAsStream("/jBPM.properties"));
    } catch (Throwable t) {
    // do nothing, use defaults
    }

    return properties;
}

I replaced the loading Mechanism and now it is loading the jBPM.properties correctly:

public static Properties getProperties() {
    Properties properties = new Properties();
    try {
        InputStream input
            = new FileInputStream("./resources/META-INF/jBPM.properties");
        properties.load(input);
        System.out.println("RPOP"+properties.toString());
    } catch (Throwable t) {
    // do nothing, use defaults
    }

    return properties;
}

(My answer adapted from BartoszKP - thanks)

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