今天在tomcat（7.0.8）上運行一本書的JSP源代碼時，出現如下錯誤：?
?1
?
org.apache.jasper.JasperException:?
Unable?to?compile?class?for?JSP:?
?2 ?
?3 ? An?error?occurred?at?line:? 23 ?in?the?generated?java?file
?4 ? The?method?getJspApplicationContext(ServletContext)?is?undefined?for?the?type?JspFactory
?5 ?
?6 ? Stacktrace:
?7 ? ????org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java: 95 )
?8 ? ????org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java: 330 )
?9 ? ????org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java: 457 )
10 ? ????org.apache.jasper.compiler.Compiler.compile(Compiler.java: 367 )
11 ? ????org.apache.jasper.compiler.Compiler.compile(Compiler.java: 345 )
12 ? ????org.apache.jasper.compiler.Compiler.compile(Compiler.java: 332 )
13 ? ????org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java: 594 )
14 ? ????org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java: 342 )
15 ? ????org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java: 391 )
16 ? ????org.apache.jasper.servlet.JspServlet.service(JspServlet.java: 334 )
17 ? ????javax.servlet.http.HttpServlet.service(HttpServlet.java: 722 )
18 ?
19 ?
?2 ?
?3 ? An?error?occurred?at?line:? 23 ?in?the?generated?java?file
?4 ? The?method?getJspApplicationContext(ServletContext)?is?undefined?for?the?type?JspFactory
?5 ?
?6 ? Stacktrace:
?7 ? ????org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java: 95 )
?8 ? ????org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java: 330 )
?9 ? ????org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java: 457 )
10 ? ????org.apache.jasper.compiler.Compiler.compile(Compiler.java: 367 )
11 ? ????org.apache.jasper.compiler.Compiler.compile(Compiler.java: 345 )
12 ? ????org.apache.jasper.compiler.Compiler.compile(Compiler.java: 332 )
13 ? ????org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java: 594 )
14 ? ????org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java: 342 )
15 ? ????org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java: 391 )
16 ? ????org.apache.jasper.servlet.JspServlet.service(JspServlet.java: 334 )
17 ? ????javax.servlet.http.HttpServlet.service(HttpServlet.java: 722 )
18 ?
19 ?
?
?
?
查看Tomcat的Log，發現如下錯誤：??
?1
?
SEVERE:?Failed?to?initialize?end?point?associated?with?ProtocolHandler?
[
"http-apr-8088"
]
?2 ? java.lang.Exception:? Socket?bind?failed:? [ 730048 ] ?Only?one?usage?of?each?socket?address?(protocol/network?address/port)?is?normally?permitted.??
?3 ? ????at?org.apache.tomcat.util.net.AprEndpoint.bind(AprEndpoint.java: 408 )
?4 ? ????at?org.apache.tomcat.util.net.AbstractEndpoint.init(AbstractEndpoint.java: 511 )
?5 ? ????at?org.apache.coyote.AbstractProtocolHandler.init(AbstractProtocolHandler.java: 345 )
?6 ? ????at?org.apache.catalina.connector.Connector.initInternal(Connector.java: 910 )
?7 ? ????at?org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java: 101 )
?8 ? ????at?org.apache.catalina.core.StandardService.initInternal(StandardService.java: 559 )
?9 ? ????at?org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java: 101 )
10 ? ????at?org.apache.catalina.core.StandardServer.initInternal(StandardServer.java: 778 )
11 ? ????at?org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java: 101 )
12 ? ????at?org.apache.catalina.startup.Catalina.load(Catalina.java: 572 )
13 ? ????at?org.apache.catalina.startup.Catalina.load(Catalina.java: 595 )
14 ? ????at?sun.reflect.NativeMethodAccessorImpl.invoke0(Native?Method)
15 ? ????at?sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java: 39 )
16 ? ????at?sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java: 25 )
17 ? ????at?java.lang.reflect.Method.invoke(Method.java: 597 )
18 ? ????at?org.apache.catalina.startup.Bootstrap.load(Bootstrap.java: 263 )
19 ? ????at?org.apache.catalina.startup.Bootstrap.main(Bootstrap.java: 431 )
?2 ? java.lang.Exception:? Socket?bind?failed:? [ 730048 ] ?Only?one?usage?of?each?socket?address?(protocol/network?address/port)?is?normally?permitted.??
?3 ? ????at?org.apache.tomcat.util.net.AprEndpoint.bind(AprEndpoint.java: 408 )
?4 ? ????at?org.apache.tomcat.util.net.AbstractEndpoint.init(AbstractEndpoint.java: 511 )
?5 ? ????at?org.apache.coyote.AbstractProtocolHandler.init(AbstractProtocolHandler.java: 345 )
?6 ? ????at?org.apache.catalina.connector.Connector.initInternal(Connector.java: 910 )
?7 ? ????at?org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java: 101 )
?8 ? ????at?org.apache.catalina.core.StandardService.initInternal(StandardService.java: 559 )
?9 ? ????at?org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java: 101 )
10 ? ????at?org.apache.catalina.core.StandardServer.initInternal(StandardServer.java: 778 )
11 ? ????at?org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java: 101 )
12 ? ????at?org.apache.catalina.startup.Catalina.load(Catalina.java: 572 )
13 ? ????at?org.apache.catalina.startup.Catalina.load(Catalina.java: 595 )
14 ? ????at?sun.reflect.NativeMethodAccessorImpl.invoke0(Native?Method)
15 ? ????at?sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java: 39 )
16 ? ????at?sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java: 25 )
17 ? ????at?java.lang.reflect.Method.invoke(Method.java: 597 )
18 ? ????at?org.apache.catalina.startup.Bootstrap.load(Bootstrap.java: 263 )
19 ? ????at?org.apache.catalina.startup.Bootstrap.main(Bootstrap.java: 431 )
?
?
開始以為是Server的配置有問題，網上搜了一下，發現都說是Tomcat開了多個造成，或者是JSP的code有問題。
但是自己又試了試Tomcat自帶的JSP，人家的jsp運行的好好的。
所以覺得Tomcat應該沒有什么配置上的問題。
后來查到這本書帶的源代碼中的build.xml文件，是這樣設置的：?
?1
?
??
<
property?
environment
="env"
?
/>
?2 ? ?? < property? name ="src" ?value ="WEB-INF/src" ? />
?3 ? ?? < property? name ="classes" ?value ="WEB-INF/classes" ? />
?4 ? ?? < property? name ="lib" ?value ="WEB-INF/lib" ? /> ?
?5 ? ?? < property? name ="dist" ?value ="dist" ? />
?6 ? ??
?7 ? ?? < path? id ="task.classpath" >
?8 ? ???? < pathelement? location ="${classes}" ? />
?9 ? ???? < pathelement? location ="${lib}" ? /> ?
10 ? ????
11 ? ???? <!-- ? Tomcat?5.0.16 ? Servlet?2.4?API? -->
12 ? ???? < pathelement? location ="${lib}/servlet-api.jar" ? />
13 ? ????
14 ? ???? <!-- ? Tomcat?5.0.16? JSP?2.0?API? -->
15 ? ???? < pathelement? location ="${lib}/jsp-api.jar" ? />
16 ? ????
17 ? ?? </ path >
?2 ? ?? < property? name ="src" ?value ="WEB-INF/src" ? />
?3 ? ?? < property? name ="classes" ?value ="WEB-INF/classes" ? />
?4 ? ?? < property? name ="lib" ?value ="WEB-INF/lib" ? /> ?
?5 ? ?? < property? name ="dist" ?value ="dist" ? />
?6 ? ??
?7 ? ?? < path? id ="task.classpath" >
?8 ? ???? < pathelement? location ="${classes}" ? />
?9 ? ???? < pathelement? location ="${lib}" ? /> ?
10 ? ????
11 ? ???? <!-- ? Tomcat?5.0.16 ? Servlet?2.4?API? -->
12 ? ???? < pathelement? location ="${lib}/servlet-api.jar" ? />
13 ? ????
14 ? ???? <!-- ? Tomcat?5.0.16? JSP?2.0?API? -->
15 ? ???? < pathelement? location ="${lib}/jsp-api.jar" ? />
16 ? ????
17 ? ?? </ path >
?
?
?
這Tomcat的版本比我的要老的多啊。
后來用tomcat的Lib目錄下的這兩個jar包替換掉之后，就好了。 JSP就可以編譯運行了。
?
總結一下，“ Unable?to?compile?class?for?JSP ” 八成和編譯用的 “ jsp-api.jar ”是有關系的。
?
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