调用一个private构造函数类的问题

lvzi98 2014-06-19 11:40:05

一个工具类PropertiesUtil1，代码如下

package com.wcg.util;





import java.io.IOException;

import java.io.InputStream;

import java.util.Properties;



public class PropertiesUtil1

{

	private static  String userPointUrl; 

    private static  String userNickUrl; 

    private static  String pointOperUrl;



    static { 

        Properties prop = new Properties(); 

        InputStream in = Object.class.getResourceAsStream("/resources/uts.properties"); 

        try { 

            prop.load(in); 

            userPointUrl = prop.getProperty("arrears.url").trim(); 

            userNickUrl = prop.getProperty("transaction.url").trim(); 

            pointOperUrl = prop.getProperty("order.url").trim(); 

            

        } catch (IOException e) { 

            e.printStackTrace(); 

        } 

    } 



    /** 

     * 

     */ 

    private PropertiesUtil1() { 

    } 



    public static String getUserPointUrl() { 

        return userPointUrl; 

    } 



    public static String getUserNickUrl() { 

        return userNickUrl; 

    } 



    public static String getPointOperUrl() { 

        return pointOperUrl; 

    } 

    

    public static void main(String args[]){ 

        System.out.println(PropertiesUtil1.getUserPointUrl()); 

//        System.out.println(getUserNickUrl()); 

    } 



}

直接运行没有问题，能打印出结果，如果在
action中调用如下所示，就会报反射错误，启动时正常

	public String loginCheck() {

              //读取配置文件，

		String url = PropertiesUtil1.getPointOperUrl();

		System.out.println(url);

		// session.getAttribute(Constants.SESSION_USER) == null,暂时不考虑SESSION

		HttpSession session = ServletActionContext.getRequest().getSession();

}

报的异常如下

ERROR 2014-06-19 11:28:08 - Exception occurred during processing request: null

java.lang.reflect.InvocationTargetException

	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)

	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

	at java.lang.reflect.Method.invoke(Method.java:597)

	at com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:450)

	at com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:289)

	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:252)

	at org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:256)

	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)

	at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:176)

	at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)

	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)

	at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:265)

	at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)

	at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)

	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)

	at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:138)

	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)

	at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:249)

	at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)

	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)

	at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:249)

	at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)

	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)

	at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:191)

	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)

	at org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:73)

	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)

	at org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:91)

	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)

	at org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:252)

	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)

	at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100)

	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)

	at com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141)

	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)

	at com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:145)

	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)

	at com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:171)

	at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)

	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)

	at com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:176)

	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)

	at org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)

	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)

	at com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:193)

	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)

	at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:187)

	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)

	at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:100)

	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)

	at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:54)

	at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:546)

	at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)

	at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)

	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)

	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)

	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)

	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)

	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)

	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)

	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)

	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)

	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)

	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)

	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)

	at java.lang.Thread.run(Thread.java:619)

Caused by: java.lang.NoClassDefFoundError: Could not initialize class com.wcg.util.PropertiesUtil1

	at com.wcg.action.LoginAction.loginCheck(LoginAction.java:129)

	... 67 more

大神可知道是什么原因，用的struts2

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lvzi98 2014-06-24

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是的。这个类不能实例化他

oh_Maxy 2014-06-20

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PropertiesUtil1是提供静态功能不需要实例化，可能某个地方做了注入配置或者注解。

lvzi98 2014-06-20

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牛人很多啊……

疯癫行者 2014-06-19

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引用 5 楼 magi1201 的回复:

读取配置文件，也可以通过线程去获取，这样就不用每次都改前面的类名称。
Thread.currentThread().getClass().getResourceAsStream(fileUrl)

姜小白- 2014-06-19

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读取配置文件，也可以通过线程去获取，这样就不用每次都改前面的类名称。

Thread.currentThread().getClass().getResourceAsStream(fileUrl)

lvzi98 2014-06-19

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知道什么原因了这一行 InputStream in = Object.class.getResourceAsStream("/resources/uts.properties"); 改为这样 InputStream in = PropertiesUtil.class.getResourceAsStream("/resources/uts.properties"); 就好了

lvzi98 2014-06-19

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知道什么原因了这一行 InputStream in = Object.class.getResourceAsStream("/resources/uts.properties"); InputStream in = PropertiesUtil.class.getResourceAsStream("/resources/uts.properties");

姜小白- 2014-06-19

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按一楼说的，将构造方法改为public 试试看

疯癫行者 2014-06-19

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Caused by: java.lang.NoClassDefFoundError: Could not initialize class com.wcg.util.PropertiesUtil1 at com.wcg.action.LoginAction.loginCheck(LoginAction.java:129) ... 67 more 可能什么地方想要初始化你的这个类，但是由于构造方法是private的，所以初始化失败。可以把构造方法去掉或者改成public试试看，找找原因。