小编pre*_*rem的帖子

当我启动tomcat时,我收到此错误

java.lang.NoClassDefFoundError: javax/servlet/Filter
at java.lang.ClassLoader.findBootstrapClass(Native Method)
at java.lang.ClassLoader.findBootstrapClass0(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at      org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1301)
at    org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1232)
at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:207)
at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:302)
at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:78)
at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:3666)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4258)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1014)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:736)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1014)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
at org.apache.catalina.core.StandardService.start(StandardService.java:448)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:700)
at org.apache.catalina.startup.Catalina.start(Catalina.java:552)
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 org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:295)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:433)

我已经将servlet.jar放在classpath和tomcat_home/commons/lib文件夹中

请任何人建议做什么.

我试图使用Jettison解析JSON对象.这是我正在使用的代码

String s ="{\"appUsage\":[{\"appName\":\"ANDROID\",\"totalUsers\":\"0\"},{\"appName\":\"IOS\",\"totalUsers\":\"4\"}]}";

JSONObject obj = new JSONObject(s);

ArrayList<MiAppUsage> l1 =  (ArrayList<MiAppUsage>) jsonParser(ArrayList.class, obj);

public static Object jsonParser(Class c, JSONObject obj)
            throws JSONException, XMLStreamException, JAXBException {
        JAXBContext jc = JAXBContext.newInstance(c);
        Configuration config = new Configuration();
        MappedNamespaceConvention con = new MappedNamespaceConvention(config);
        XMLStreamReader xmlStreamReader = new MappedXMLStreamReader(obj, con);

        Unmarshaller unmarshaller = jc.createUnmarshaller();
        ArrayList<MiAppUsage>customer = (ArrayList<MiAppUsage>) unmarshaller.unmarshal(xmlStreamReader);
        return customer;
    }

我收到了这个错误

线程"main"中的异常javax.xml.bind.UnmarshalException - 带有链接异常:[javax.xml.bind.UnmarshalException:unexpected element(uri:"",local:"appUsage").com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl上的com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.handleStreamException(未知来源)中的预期元素为(none)]. un comrshal0(未知来源)com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal(未知来源)com.json.UnmarshalDemo.jsonParser(UnmarshalDemo.java:56)com.json.UnmarshalDemo .main(UnmarshalDemo.java:33)引起:javax.xml.bind.UnmarshalException:意外元素(uri:"",local:"appUsage").com.sun.xml.internal.bind.v2.runtime.unmarshaller.Loader.reportError中的com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext.handleEvent(未知来源)中的预期元素为(无). (未知来源)com.sun.xml.internal.bind.v2.runtime.unmarshaller.Loader.reportError(未知来源)com.sun.xml.internal.bind.v2.runtime.unmarshaller.Loader.reportUnexpectedChildElement(未知)来自com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext $ defaultRootLoader.childElement(未知来源)com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext._startElement(未知)来自com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext.startElement(未知来源)的com.sun.xml.internal.bind.v2.runtime.unmarshaller.InterningXmlVisitor.startElement(未知来源)在com.sun.xml.internal.bind.v2.runtime.unmarshall的com.sun.xml.internal.bind.v2.runtime.unmarshaller.StAXStreamConnector.handleStartElement(未知来源)er.StAXStreamConnector.bridge(未知来源)... 4更多引起:javax.xml.bind.UnmarshalException:意外元素(uri:"",local:"appUsage").预期的要素是(无)......还有14个

如何解决这个问题