org.apache.jasper.JasperException: /XX.jsp(10,0) The value for the useBean class attribute 包.类 is invalid解决方法

报错信息：

org.apache.jasper.JasperException: /javabean.jsp(10,0) The value for the useBean class attribute javabean.User is invalid.
at org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:40)
at org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:407)
at org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:148)
at org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1220)atorg.apache.jasper.compiler.Node$UseBean.accept(Node.java:1178)
at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2361)atorg.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2411)
at org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2417)atorg.apache.jasper.compiler.Node$Root.accept(Node.java:495)
at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2361)atorg.apache.jasper.compiler.Generator.generate(Generator.java:3416)atorg.apache.jasper.compiler.Compiler.generateJava(Compiler.java:231)atorg.apache.jasper.compiler.Compiler.compile(Compiler.java:347)atorg.apache.jasper.compiler.Compiler.compile(Compiler.java:327)atorg.apache.jasper.compiler.Compiler.compile(Compiler.java:314)atorg.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:589)atorg.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:317)atorg.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)atorg.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)atjavax.servlet.http.HttpServlet.service(HttpServlet.java:717)atorg.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)atorg.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)atorg.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)atorg.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)atorg.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)atorg.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)atorg.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)atorg.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)atorg.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852)atorg.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:748)

百度查看了很多资料依然找不了解决办法，最后查JavaBean的特征：

1、提供一个默认的无参构造函数。
2、需要被序列化并且实现了Serializable接口。
3、可能有一系列可读写属性。
4、可能有一系列的”getter”或”setter”方法。

查看了我的实体类只有无参构造函数和getXX和setXX方法。加上实现Serializable接口且序列化，问题解决

package javabeandemo;

import java.io.Serializable;

public class User implements Serializable{
	private static final long serialVersionUID = -8535778739754609087L;
	private String username;
	private String password;
	public User() {
	}
	public String getUsername() {
		return username;
	}
	public void setUsername(String username) {
		this.username = username;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
}

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