是這樣的,我用的是Intellij 導入了一個MyEclipse的包(該包已部署在服務器上，所以是沒有大錯誤的)。

然后在一個jsp文件出現了個問題：

莫名奇妙地println變成了紅色，執行的時候就直接拋出異常了。

今天剛接觸JavaWeb不太懂，到底是怎么回事呢？

異常：

type Exception report

message An exception occurred processing JSP page /blackphones.jsp at line 15

description The server encountered an internal error that prevented it from fulfilling this request.

exception

org.apache.jasper.JasperException: An exception occurred processing JSP page /blackphones.jsp at line 15

12:

13: String [] phones = (String []) request.getAttribute("blackphones");

14:

15: out.println("褰撳墠鏈� + phones.length + "涓墜鏈哄彿鐮侊細
");

16:

17: for(String phone : phones){

18: out.println(phone + "?????");

Stacktrace:

org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:575)

org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:477)

org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)

org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)

javax.servlet.http.HttpServlet.service(HttpServlet.java:731)

org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

com.aspire.mmlite.server.servlet.LogFilter.doFilter(LogFilter.java:63)

root cause

java.lang.NullPointerException

org.apache.jsp.blackphones_jsp._jspService(blackphones_jsp.java:96)

org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)

javax.servlet.http.HttpServlet.service(HttpServlet.java:731)

org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:439)

org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)

org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)

javax.servlet.http.HttpServlet.service(HttpServlet.java:731)

org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

com.aspire.mmlite.server.servlet.LogFilter.doFilter(LogFilter.java:63)

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