Datanucleus，JDO和可执行jar-怎么做？

Question

我正在使用Datanucleus和JDO开发用于嵌入式H2数据库的桌面应用程序。当我从Eclipse运行它时，一切正常，但是当我尝试用它制作可执行jar时，它将停止工作。我收到以下错误：

org.datanucleus.exceptions.NucleusUserException：已指定持久性进程使用名称为“
jdo”的ClassLoaderResolver，但DataNucleus插件机制尚未找到该持久化过程。 请检查您的CLASSPATH和插件规范。

当然，这表明我没有正确配置某些内容-
我缺少什么？如果我错过了一些大的东西，那根本就行不通，所以我假设它是一个有缺陷的可执行jar。我已经在其他应用程序中看到了该错误，例如JPOX，该错误已得到修复，但没有给出任何解决方案。

整个错误stacktrace：

Exception in thread "main" javax.jdo.JDOFatalInternalException: Unexpected exception caught.
        at javax.jdo.JDOHelper.invokeGetPersistenceManagerFactoryOnImplementation(JDOHelper.java:1193)
        at javax.jdo.JDOHelper.getPersistenceManagerFactory(JDOHelper.java:808)
        at javax.jdo.JDOHelper.getPersistenceManagerFactory(JDOHelper.java:701)
        at db.PersistenceManagerFilter.init(PersistenceManagerFilter.java:44)
        at Main.main(Main.java:26)
NestedThrowablesStackTrace:
java.lang.reflect.InvocationTargetException
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at javax.jdo.JDOHelper$16.run(JDOHelper.java:1965)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.jdo.JDOHelper.invoke(JDOHelper.java:1960)
        at javax.jdo.JDOHelper.invokeGetPersistenceManagerFactoryOnImplementation(JDOHelper.java:1166)
        at javax.jdo.JDOHelper.getPersistenceManagerFactory(JDOHelper.java:808)
        at javax.jdo.JDOHelper.getPersistenceManagerFactory(JDOHelper.java:701)
        at db.PersistenceManagerFilter.init(PersistenceManagerFilter.java:44)
        at Main.main(Main.java:26)
Caused by: org.datanucleus.exceptions.NucleusUserException: Persistence process has been specified to use a ClassLoaderResolver of name "jdo" yet this has not been found by the DataNucleus plugin mechanism. Please check your CLASSPATH and plugin specification.
        at org.datanucleus.NucleusContext.<init>(NucleusContext.java:233)
        at org.datanucleus.NucleusContext.<init>(NucleusContext.java:196)
        at org.datanucleus.NucleusContext.<init>(NucleusContext.java:174)
        at org.datanucleus.api.jdo.JDOPersistenceManagerFactory.<init>(JDOPersistenceManagerFactory.java:364)
        at org.datanucleus.api.jdo.JDOPersistenceManagerFactory.createPersistenceManagerFactory(JDOPersistenceManagerFactory.java:294)
        at org.datanucleus.api.jdo.JDOPersistenceManagerFactory.getPersistenceManagerFactory(JDOPersistenceManagerFactory.java:195)
        ... 12 more

它指向的行是PersistenceManagerFilter初始化方法：

pmf = JDOHelper.getPersistenceManagerFactory(getProperties());

属性文件如下所示：

    javax.jdo.PersistenceManagerFactoryClass=org.datanucleus.api.jdo.JDOPersistenceManagerFactory
datanucleus.ConnectionDriverName=org.h2.Driver
datanucleus.ConnectionURL=jdbc:h2:datanucleus
datanucleus.ConnectionUserName=sa
datanucleus.ConnectionPassword=

我拥有来自maven的所有依赖关系，目标是使用依赖关系进行部署。依赖性在datanucleus页面http://www.datanucleus.org/products/datanucleus/jdo/maven.html上说明

有任何想法吗？

Answer 1

添加到DataNucleus答案。
为了满足您的需求，您应该使用 maven-dependency-plugin
并将以下内容添加到pom.xml中

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-dependency-plugin</artifactId>
            <version>2.4</version>
            <executions>
                <execution>
                    <id>copy-dependencies</id>
                    <phase>package</phase>
                    <goals>
                        <goal>copy-dependencies</goal>
                    </goals>
                    <configuration>
                        <outputDirectory>${project.build.directory}/jars</outputDirectory>
                        <overWriteReleases>false</overWriteReleases>
                        <overWriteSnapshots>false</overWriteSnapshots>
                        <overWriteIfNewer>true</overWriteIfNewer>
                    </configuration>
                </execution>
            </executions>
        </plugin>
    </plugins>
</build>

然后，依赖项将位于 target / jars 目录中。

要执行您的应用程序，请使用以下命令：

Windows：
java -cp“ yourFile.jar; jars / *” package.className

Linux：
java -cp“ yourFile.jar：jars / *” package.className

注意：请勿使用jars / * .jar，这将无法正常工作