任务创建的JAXBContext:批量处理来转换数据,并将结果存储在磁盘上的XML文件。问题OSGI包
问题:编组对象,在OSGI包中加载JAXBContextFactory。 FutureTask中的java.lang.NoClassDefFoundError: org/eclipse/persistence/internal/libraries/asm/ClassWriter
引起的死锁:311。没有堆栈跟踪或原因。
问题:为了让JAXBContext实例化起作用,我错过了什么样的设置或导入?
说明:
进行数据处理,我需要我的POJO类存储在磁盘上的XML文件。 POJO类从与填充在分批过程,然后保存到磁盘在那里将被进一步处理JAXB2-行家-插件(XJC)XSD文件生成。
从不同的堆栈溢出的问题,我了解到,OSGI使用不同的类加载器,我必须使用正确的newInstance方法实例化JAXBContext中。 (答案:https://stackoverflow.com/a/1043807/7461710)。
这是我当前的newInstance调用,PrintDocument类位于自动生成的包com.some.package.generated
中,ObjectFactory位于同一个包中,也由jaxb2-maven-plugin生成。 在newInstance调用期间,Programm失败。
JAXBContext jaxbContext = JAXBContext.newInstance(PrintDocument.class.getPackage().getName(),
ObjectFactory.class.getClassLoader());
Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
日志文件:
DEBUG XMLUtil:24 -Step 4/4: Save result into file. path: /somewhere/result.xml
DEBUG bind:282 - Searching jaxb.properties
DEBUG bind:300 - Searching the system property
DEBUG bind:565 - Trying to load org.eclipse.persistence.jaxb.JAXBContextFactory
[no further output]
我们使用BND导入包,我已被捆绑的bnd.bnd文件
Import-Package: \
org.eclipse.persistence.jaxb,\
*
由于JAXB实现我用MOXY。
如果我添加此jaxb.properties文件生成的POJO包:
javax.xml.bind.context.factory=org.eclipse.persistence.jaxb.JAXBContextFactory
没有发现普通班会抛出异常。即使在我的单元测试中。 (另外,单元测试执行编组OSGi包外)
javax.xml.bind.JAXBException: Provider org.eclipse.persistence.jaxb.JAXBContextFactory not found
- with linked exception:
[java.lang.ClassNotFoundException: org.eclipse.persistence.jaxb.JAXBContextFactory ]
at javax.xml.bind.ContextFinder.newInstance(ContextFinder.java:134)
at javax.xml.bind.ContextFinder.find(ContextFinder.java:293)
at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:431)
at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:394)
[...]
但是,如果我改变在此基础上回答https://stackoverflow.com/a/6820113/7461710中的newInstance调用JAXBContextFactory.createContext
,我的单元测试再次工作和PROGRAMM卡在死锁如上所述由java.lang.NoClassDefFoundError: org/eclipse/persistence/internal/libraries/asm/ClassWriter
引起。
项目依赖:
<dependency>
<groupId>biz.aQute.bnd</groupId>
<artifactId>biz.aQute.launcher</artifactId>
<version>3.3.0</version>
</dependency>
<dependency>
<groupId>org.eclipse.platform</groupId>
<artifactId>org.eclipse.osgi</artifactId>
<version>3.11.2</version>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.5</version>
</dependency>
<dependency>
<groupId>org.ops4j.pax.logging</groupId>
<artifactId>pax-logging-api</artifactId>
<version>1.9.1</version>
</dependency>
<dependency>
<groupId>org.ops4j.pax.logging</groupId>
<artifactId>pax-logging-service</artifactId>
<version>1.9.1</version>
</dependency>
<dependency>
<groupId>org.json</groupId>
<artifactId>json</artifactId>
<version>20160810</version>
</dependency>
<dependency>
<groupId>org.zeroturnaround</groupId>
<artifactId>zt-exec</artifactId>
<version>1.9</version>
</dependency>
<dependency>
<groupId>com.io7m.xom</groupId>
<artifactId>xom</artifactId>
<version>1.2.10</version>
</dependency>
<dependency>
<groupId>org.ops4j.pax.jdbc</groupId>
<artifactId>pax-jdbc</artifactId>
<version>0.9.0</version>
<exclusions>
<exclusion>
<groupId>org.osgi</groupId>
<artifactId>org.osgi.compendium</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.ops4j.pax.jdbc</groupId>
<artifactId>pax-jdbc-h2</artifactId>
<version>0.4.0</version>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<version>1.4.193</version>
</dependency>
<dependency>
<groupId>org.ops4j.pax.jdbc</groupId>
<artifactId>pax-jdbc-oracle</artifactId>
<version>0.9.0</version>
</dependency>
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.5</version>
</dependency>
<dependency>
<groupId>org.osgi</groupId>
<artifactId>org.osgi.core</artifactId>
<version>6.0.0</version>
</dependency>
<dependency>
<groupId>org.osgi</groupId>
<artifactId>osgi.cmpn</artifactId>
<version>6.0.0</version>
</dependency>
<dependency>
<groupId>org.apache.felix</groupId>
<artifactId>org.apache.felix.scr</artifactId>
<version>2.0.6</version>
</dependency>
<dependency>
<groupId>org.apache.servicemix.bundles</groupId>
<artifactId>org.apache.servicemix.bundles.asm</artifactId>
<version>3.3.1_1</version>
</dependency>
<dependency>
<groupId>org.apache.servicemix.bundles</groupId>
<artifactId>org.apache.servicemix.bundles.saxon</artifactId>
<version>9.7.0-10_1</version>
</dependency>
<dependency>
<groupId>xml-resolver</groupId>
<artifactId>xml-resolver</artifactId>
<version>1.2</version>
</dependency>
<dependency>
<groupId>org.apache.felix</groupId>
<artifactId>org.apache.felix.configadmin</artifactId>
<version>1.8.12</version>
</dependency>
<dependency>
<groupId>org.apache.felix</groupId>
<artifactId>org.apache.felix.gogo.shell</artifactId>
<version>1.0.0</version>
</dependency>
<dependency>
<groupId>org.apache.felix</groupId>
<artifactId>org.apache.felix.gogo.command</artifactId>
<version>1.0.0</version>
<exclusions>
<exclusion>
<groupId>org.osgi</groupId>
<artifactId>org.osgi.compendium</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.apache.felix</groupId>
<artifactId>org.apache.felix.gogo.runtime</artifactId>
<version>1.0.0</version>
</dependency>
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>org.eclipse.persistence.moxy</artifactId>
<version>2.6.4</version>
</dependency>
我没有与MOXY经验,但是从JRE的JAXB支持正常工作对我来说。你试过这个吗? –
@ChristianSchneider我应该在jaxb.properties中设置我的JAXBContextFactory包? 'javax.xml.bind.JAXBContextFactory'不工作 – doofmars