在新的电脑上配置系统时，运行出现以下错误，
java.lang.SecurityException: sealing violation
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:234)
        at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:297)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:286)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:253)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:313)
        at com.jfsys.exam.system.log.(log.java:41)
        at java.lang.Class.newInstance0(Native Method)
        at java.lang.Class.newInstance(Class.java:237)
        at java.beans.Beans.instantiate(Beans.java:207)
        at java.beans.Beans.instantiate(Beans.java:51)
        at log._0005clog_0005clogMan_0002ejsplogMan_jsp_3._jspService(_0005clog_
0005clogMan_0002ejsplogMan_jsp_3.java:87)
        at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:126)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:865)
        at org.apache.jasper.runtime.JspServlet$JspServletWrapper.service(JspSer
vlet.java:161)
        at org.apache.jasper.runtime.JspServlet.serviceJspFile(JspServlet.java:2
47)
        at org.apache.jasper.runtime.JspServlet.service(JspServlet.java:352)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:865)
        at org.apache.tomcat.core.ServiceInvocationHandler.method(ServletWrapper
.java:626)
        at org.apache.tomcat.core.ServletWrapper.handleInvocation(ServletWrapper
.java:534)
        at org.apache.tomcat.core.ServletWrapper.handleRequest(ServletWrapper.ja
va:378)
        at org.apache.tomcat.core.Context.handleRequest(Context.java:644)
        at org.apache.tomcat.core.ContextManager.service(ContextManager.java:440
)
        at org.apache.tomcat.service.http.HttpConnectionHandler.processConnectio
n(HttpConnectionHandler.java:144)
        at org.apache.tomcat.service.TcpConnectionThread.run(TcpEndpoint.java:31
0)
        at java.lang.Thread.run(Thread.java:484)

检查你的Classpath配置好了没有

修改你java.policy文件，在JBuilder7jdk1.3.1jrelibsecurity中。
如permission java.security.AllPermission;

win98是不行的