jfianl 以webapp为根目录 render报错问题

Question

本人使用`maven`来管理`jfinal`的依赖加入了一下包：

                <dependency>
			<groupId>com.jfinal</groupId>
			<artifactId>jfinal</artifactId>
			<version>2.1</version>
		</dependency>

		<dependency>
			<groupId>com.jfinal</groupId>
			<artifactId>jetty-server</artifactId>
			<version>8.1.8</version>
		</dependency>
		<dependency>
			<groupId>com.jfinal</groupId>
			<artifactId>jfinal-ext</artifactId>
			<version>3.1.4</version>
		</dependency>
		<dependency>
			<groupId>com.mchange</groupId>
			<artifactId>c3p0</artifactId>
			<version>0.9.5.1</version>
		</dependency>
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<version>5.1.20</version>
		</dependency>

首先创建的的普通的maven项目，然后改成的web项目，设置web的根目录为`src/main/webapp`

其他的为默认。Deployment里面的参数如下:

/src/main/java    WEB-INF/classes
/src/main/webapp  /
/src/main/webapp  WEB-INF/classes
/src/test/java    WEB-INF/classes

然后在webapp目录下创建一个test.jsp文件

在已经设置好的Controller里设置render

@ActionKey("/test")
	public void test(){
		render("/test.jsp");
	}

会提示下面内容：

Starting JFinal 2.1
Starting scanner at interval of 5 seconds.
Starting web server on port: 8080
/home/innerac/workspace/jfianlm/src/main/webapp
一月 17, 2016 6:16:33 下午 com.mchange.v2.log.MLog 
信息: MLog clients using java 1.4+ standard logging.
一月 17, 2016 6:16:34 下午 com.mchange.v2.c3p0.C3P0Registry 
信息: Initializing c3p0-0.9.5.1 [built 16-June-2015 00:06:36 -0700; debug? true; trace: 10]
一月 17, 2016 6:16:34 下午 com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource 
信息: Initializing c3p0 pool... com.mchange.v2.c3p0.ComboPooledDataSource [ acquireIncrement -> 2, acquireRetryAttempts -> 30, acquireRetryDelay -> 1000, autoCommitOnClose -> false, automaticTestTable -> null, breakAfterAcquireFailure -> false, checkoutTimeout -> 0, connectionCustomizerClassName -> null, connectionTesterClassName -> com.mchange.v2.c3p0.impl.DefaultConnectionTester, contextClassLoaderSource -> caller, dataSourceName -> z8kfsx9elxyyg31nac9a8|6e06451e, debugUnreturnedConnectionStackTraces -> false, description -> null, driverClass -> com.mysql.jdbc.Driver, extensions -> {}, factoryClassLocation -> null, forceIgnoreUnresolvedTransactions -> false, forceSynchronousCheckins -> false, forceUseNamedDriverClass -> false, identityToken -> z8kfsx9elxyyg31nac9a8|6e06451e, idleConnectionTestPeriod -> 0, initialPoolSize -> 10, jdbcUrl -> jdbc:mysql://127.0.0.1/swjsysq, maxAdministrativeTaskTime -> 0, maxConnectionAge -> 0, maxIdleTime -> 20, maxIdleTimeExcessConnections -> 0, maxPoolSize -> 100, maxStatements -> 0, maxStatementsPerConnection -> 0, minPoolSize -> 10, numHelperThreads -> 3, preferredTestQuery -> null, privilegeSpawnedThreads -> false, properties -> {user=******, password=******}, propertyCycle -> 0, statementCacheNumDeferredCloseThreads -> 0, testConnectionOnCheckin -> false, testConnectionOnCheckout -> false, unreturnedConnectionTimeout -> 0, userOverrides -> {}, usesTraditionalReflectiveProxies -> false ]
Starting Complete. Welcome To The JFinal World :)
/home/innerac/workspace/jfianlm/target/classes/edu/innerac/jfianlm/controller
一月 17, 2016 6:16:42 下午 com.jfinal.core.ActionHandler error
严重: /test
java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
	at com.jfinal.aop.Invocation.invoke(Invocation.java:87)
	at com.jfinal.core.ActionHandler.handle(ActionHandler.java:82)
	at com.jfinal.core.JFinalFilter.doFilter(JFinalFilter.java:72)
	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1307)
	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:453)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:560)
	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1072)
	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:382)
	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1006)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
	at org.eclipse.jetty.server.Server.handle(Server.java:365)
	at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:485)
	at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:926)
	at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:988)
	at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:635)
	at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235)
	at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)
	at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:628)
	at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:52)
	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
	at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:497)
	at com.jfinal.aop.Invocation.invoke(Invocation.java:73)
	... 25 more
Caused by: java.lang.NoClassDefFoundError: javax/el/ELResolver
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:760)
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
	at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
	at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	at com.jfinal.render.JspRender.<clinit>(JspRender.java:41)
	at com.jfinal.render.RenderFactory$JspRenderFactory.getRender(RenderFactory.java:294)
	at com.jfinal.render.RenderFactory.getRender(RenderFactory.java:170)
	at com.jfinal.core.Controller.render(Controller.java:965)
	at edu.innerac.jfianlm.controller.InneracController.test(InneracController.java:42)
	... 30 more
Caused by: java.lang.ClassNotFoundException: javax.el.ELResolver
	at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	... 47 more

我在其中打印`webroot`目录如下：

String webRoot = PathKit.getWebRootPath();
System.out.println(webRoot);

他的输出时预期的目录：

/home/innerac/workspace/jfianlm/src/main/webapp

即使我将test.jsp放到和控制器同一个目录下然后改成render("test.jsp")也是同样的错误。

求解答啊？

Answer 1

最近我也闲得蛋痛，在折腾Maven，把原来的JFinal项目迁移到Maven下之后依赖包应该全了，应用也启动正常，就是访问出错。请教下：JFinal.start("xxxxxxxx", 8090, "/web", 5); 这里的xxxx路径是指向哪个目录？

Answer 2

回复
我的是这样的

Answer 3

回复
我的是这样的 src/main/webapp 8080 / 5 应该是默认输出路径

Answer 4

我将.m2下的jetty-server-8.1.8.jar这个依赖包换成官网下载的依赖包就可以用了。

Answer 5

发现了原因所在，在官网下载的jar包里面内容是这样的：

而通过maven仓库下载下来的包是这样的

包里面的内容不太一样，所以找不到类了

java.lang.NoClassDefFoundError: javax/el/ELResolver

Answer 6

好的，谢谢我去试一试，主要是和我以前用非maven方式加入的包一样，可是这里出错了。再次感谢

Answer 7

您好，能不能看一下下面的那个回答，请问有什么好的解决办法

Answer 8

   注意看这个异常信息：
Caused by: java.lang.NoClassDefFoundError: javax/el/ELResolver，证明是缺少 jar 包，在jfinal官网下载 jfinal-2.1-all.zip这个文件，里面有个 lib目录，其中有一个jar使用说明文件，打开这个文件，找到jsp、jstl所需要的相关 jar包，放入即可。