Java-使用Xstream序列化非可序列化对象

时间：2014-10-01 09:53:24

标签： java serialization xstream

我试图序列化第三方类（不可序列化），并且我正在使用xstream这样做。

起初我尝试构建一些类来查看它是否运行良好并且一切正常但是当我尝试将第三方实例转换为xml时，它会使异常成为现实。

代码：

import java.util.List;
import java.util.Set;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.PrintStream;
import java.io.*;
import java.util.*;
import java.util.logging.*;
import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.io.xml.DomDriver;
import vohmm.application.SimpleTagger3;

public class Tagger{

    public static void main(String[] args) {
        try {
            SimpleTagger3 tagger = new SimpleTagger3(args[0]);
            XStream xStream = new XStream(new DomDriver());

            String tagger_xml = xStream.toXML(tagger);
        } catch (Exception e) {
            e.printStackTrace(); 
            System.exit(0);
        }
    }
 }

例外：

Exception in thread "main" java.lang.NoClassDefFoundError: com/sleepycat/je/DatabaseException
    at java.lang.Class.getDeclaredMethods0(Native Method)
    at java.lang.Class.privateGetDeclaredMethods(Class.java:2570)
    at java.lang.Class.getDeclaredMethod(Class.java:2002)
    at com.thoughtworks.xstream.converters.reflection.SerializationMethodInvoker.getMethod(SerializationMethodInvoker.java:164)
    at com.thoughtworks.xstream.converters.reflection.SerializationMethodInvoker.getMethod(SerializationMethodInvoker.java:148)
    at com.thoughtworks.xstream.converters.reflection.SerializationMethodInvoker.supportsReadObject(SerializationMethodInvoker.java:105)
    at com.thoughtworks.xstream.converters.reflection.SerializableConverter.isSerializable(SerializableConverter.java:107)
    at com.thoughtworks.xstream.converters.reflection.SerializableConverter.canConvert(SerializableConverter.java:103)
    at com.thoughtworks.xstream.core.DefaultConverterLookup.lookupConverterForType(DefaultConverterLookup.java:56)
    at com.thoughtworks.xstream.XStream$1.lookupConverterForType(XStream.java:498)
    at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:48)
    at com.thoughtworks.xstream.core.AbstractReferenceMarshaller$1.convertAnother(AbstractReferenceMarshaller.java:84)
    at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.marshallField(AbstractReflectionConverter.java:250)
    at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter$2.writeField(AbstractReflectionConverter.java:226)
    at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter$2.<init>(AbstractReflectionConverter.java:189)
    at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.doMarshal(AbstractReflectionConverter.java:135)
    at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.marshal(AbstractReflectionConverter.java:83)
    at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:69)
    at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:58)
    at com.thoughtworks.xstream.core.AbstractReferenceMarshaller$1.convertAnother(AbstractReferenceMarshaller.java:84)
    at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.marshallField(AbstractReflectionConverter.java:250)
    at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter$2.writeField(AbstractReflectionConverter.java:226)
    at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter$2.<init>(AbstractReflectionConverter.java:189)
    at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.doMarshal(AbstractReflectionConverter.java:135)
    at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.marshal(AbstractReflectionConverter.java:83)
    at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:69)
    at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:58)
    at com.thoughtworks.xstream.core.AbstractReferenceMarshaller$1.convertAnother(AbstractReferenceMarshaller.java:84)
    at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.marshallField(AbstractReflectionConverter.java:250)
    at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter$2.writeField(AbstractReflectionConverter.java:226)
    at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter$2.<init>(AbstractReflectionConverter.java:189)
    at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.doMarshal(AbstractReflectionConverter.java:135)
    at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.marshal(AbstractReflectionConverter.java:83)
    at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:69)
    at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:58)
    at com.thoughtworks.xstream.core.AbstractReferenceMarshaller$1.convertAnother(AbstractReferenceMarshaller.java:84)
    at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.marshallField(AbstractReflectionConverter.java:250)
    at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter$2.writeField(AbstractReflectionConverter.java:226)
    at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter$2.<init>(AbstractReflectionConverter.java:189)
    at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.doMarshal(AbstractReflectionConverter.java:135)
    at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.marshal(AbstractReflectionConverter.java:83)
    at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:69)
    at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:58)
    at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:43)
    at com.thoughtworks.xstream.core.TreeMarshaller.start(TreeMarshaller.java:82)
    at com.thoughtworks.xstream.core.AbstractTreeMarshallingStrategy.marshal(AbstractTreeMarshallingStrategy.java:37)
    at com.thoughtworks.xstream.XStream.marshal(XStream.java:1022)
    at com.thoughtworks.xstream.XStream.marshal(XStream.java:1011)
    at com.thoughtworks.xstream.XStream.toXML(XStream.java:984)
    at com.thoughtworks.xstream.XStream.toXML(XStream.java:971)
    at NewDemo.main(NewDemo.java:51)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:134)
Caused by: java.lang.ClassNotFoundException: com.sleepycat.je.DatabaseException
    at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
    ... 56 more

为什么xstream不能使用SimpleTagger3？有没有其他方法可以导出java对象？

1 个答案:

答案 0 :(得分：0)

您的类加载器无法加载名为“com.sleepycat.je.DatabaseException”的类。 确保此课程可用。尝试Class.forName("com.sleepycat.je.DatabaseException")来测试该课程是否可用。 如果没有将它添加到类路径中或使用ClassLoader加载它。

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