Question

我正在尝试制作datanucleus，使用Mongodb（使用JDO）。成功后

mvn clean compile
mvn exec:java

当我第一次跑步时，

失败了

caused by: org.datanucleus.exceptions.NucleusUserException: Found Meta-Data for class com.samples.jdo.mongodb.Account but this class is either not enhanced or you have multiple copies of jdo-api.jar in your CLASSPATH!! Make sure all persistable classes are enhanced before running DataNucleus and/or the CLASSPATH is correct.

但如果我再次运行它工作正常，我也可以看到数据在mongodb中持续存在。

        // Create a PersistenceManagerFactory for this datastore
    PersistenceManagerFactory pmf = JDOHelper.getPersistenceManagerFactory("datanucleus.properties", this.getClass().getClassLoader());
    JDOMetadata jdomd = pmf.newMetadata(); 
    PackageMetadata pmd = jdomd.newPackageMetadata("com.samples.jdo.mongodb");
    ClassMetadata cmd1 = pmd.newClassMetadata(Account.class);
    cmd1.setTable("Account").setIdentityType(javax.jdo.annotations.IdentityType.DATASTORE);
    cmd1.setPersistenceModifier(ClassPersistenceModifier.PERSISTENCE_CAPABLE);

    ClassMetadata cmd2 = pmd.newClassMetadata(Login.class); 
    cmd2.setTable("LOGIN").setIdentityType(javax.jdo.annotations.IdentityType.DATASTORE);
    cmd2.setPersistenceModifier(ClassPersistenceModifier.PERSISTENCE_CAPABLE);


        PersistenceManager pm = pmf.getPersistenceManager();
        Account acct = new Account("firstname","lastname", 3);
        Login login = new Login("flastname", "xxxx");
        acct.setLogin(login);

        final JDOEnhancer enhancer = JDOHelper.getEnhancer(); 
        enhancer.setVerbose(true); 
        enhancer.registerMetadata(jdomd);
        enhancer.setClassLoader(this.getClass().getClassLoader());
        String[] classes = {"com.samples.jdo.mongodb.Account","com.samples.jdo.mongodb.Login" };
        enhancer.addClasses(classes); 
        enhancer.enhance(); 

        pmf.registerMetadata(jdomd);            
        pm.makePersistent(acct);

任何想法？

由于

datanucleus抱怨没有增强课程，但第二次运行时工作正常。

0 个答案: