我正在使用maven将此应用程序从weblogic移植到Jboss，我现在正在第二页面对此消息。我知道自己可能缺少什么吗？
它不适用于我创建的任何JSP或我称之为的任何控制器。我试图创建一个PrintWriter的实例，它输出String。问题是通过这个函数编译任何jsp。此外，index.jsp工作正常。
server.log中的Stacktrace：
ESC[0mESC[31m09:51:38,753 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[default-host].[/cashvariance].[jsp]] (http-/0.0.0.0:8180-1) JBWEB
000236: Servlet.service() for servlet jsp threw exception: java.lang.NullPointerException
at java.io.Writer.write(Writer.java:157) [rt.jar:1.8.0_101]
at java.io.PrintWriter.newLine(PrintWriter.java:480) [rt.jar:1.8.0_101]
at java.io.PrintWriter.println(PrintWriter.java:629) [rt.jar:1.8.0_101]
at java.io.PrintWriter.println(PrintWriter.java:740) [rt.jar:1.8.0_101]
at org.apache.jasper.compiler.ServletWriter.printil(ServletWriter.java:130) [jbossweb-7.5.7.Final-redhat-1.jar:7.5.7.Final-redhat-1]
at org.apache.jasper.compiler.Generator.genPreamblePackage(Generator.java:481) [jbossweb-7.5.7.Final-redhat-1.jar:7.5.7.Final-redhat-1]
at org.apache.jasper.compiler.Generator.generatePreamble(Generator.java:584) [jbossweb-7.5.7.Final-redhat-1.jar:7.5.7.Final-redhat-1]
at org.apache.jasper.compiler.Generator.generate(Generator.java:3462) [jbossweb-7.5.7.Final-redhat-1.jar:7.5.7.Final-redhat-1]
at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:244) [jbossweb-7.5.7.Final-redhat-1.jar:7.5.7.Final-redhat-1]
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:359) [jbossweb-7.5.7.Final-redhat-1.jar:7.5.7.Final-redhat-1]
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:339) [jbossweb-7.5.7.Final-redhat-1.jar:7.5.7.Final-redhat-1]
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:326) [jbossweb-7.5.7.Final-redhat-1.jar:7.5.7.Final-redhat-1]
at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:606) [jbossweb-7.5.7.Final-redhat-1.jar:7.5.7.Final-redhat-1]
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:308) [jbossweb-7.5.7.Final-redhat-1.jar:7.5.7.Final-redhat-1]
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:309) [jbossweb-7.5.7.Final-redhat-1.jar:7.5.7.Final-redhat-1]
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:242) [jbossweb-7.5.7.Final-redhat-1.jar:7.5.7.Final-redhat-1]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:847) [jboss-servlet-api_3.0_spec-1.0.2.Final-redhat-2.jar:1.0.2.Final-redhat-2]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:295) [jbossweb-7.5.7.Final-redhat-1.jar:7.5.7.Final-redhat-1]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214) [jbossweb-7.5.7.Final-redhat-1.jar:7.5.7.Final-redhat-1]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:231) [jbossweb-7.5.7.Final-redhat-1.jar:7.5.7.Final-redhat-1]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:149) [jbossweb-7.5.7.Final-redhat-1.jar:7.5.7.Final-redhat-1]
at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:169) [jboss-as-web-7.5.0.Final-redhat-21.jar:7.5.0.Final-redhat-21]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:150) [jbossweb-7.5.7.Final-redhat-1.jar:7.5.7.Final-redhat-1]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:97) [jbossweb-7.5.7.Final-redhat-1.jar:7.5.7.Final-redhat-1]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:102) [jbossweb-7.5.7.Final-redhat-1.jar:7.5.7.Final-redhat-1]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:344) [jbossweb-7.5.7.Final-redhat-1.jar:7.5.7.Final-redhat-1]
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:854) [jbossweb-7.5.7.Final-redhat-1.jar:7.5.7.Final-redhat-1]
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:653) [jbossweb-7.5.7.Final-redhat-1.jar:7.5.7.Final-redhat-1]
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:926) [jbossweb-7.5.7.Final-redhat-1.jar:7.5.7.Final-redhat-1]
at java.lang.Thread.run(Thread.java:745) [rt.jar:1.8.0_101]
的pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>cashvariance</groupId>
<artifactId>cashvariance</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<build>
<resources>
<resource>
<directory>WebContent</directory>
</resource>
</resources>
<finalName>cashvariance</finalName>
<sourceDirectory>src</sourceDirectory>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.5.1</version>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>
<plugin>
<artifactId>maven-war-plugin</artifactId>
<version>3.0.0</version>
<configuration>
<warSourceDirectory>WebContent</warSourceDirectory>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>jsp-api</artifactId>
<version>2.1</version>
<scope>provided</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/log4j/log4j -->
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
<!-- https://mvnrepository.com/artifact/javax.mail/mail -->
<dependency>
<groupId>javax.mail</groupId>
<artifactId>mail</artifactId>
<version>1.4</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.unboundid/unboundid-ldapsdk -->
<dependency>
<groupId>com.unboundid</groupId>
<artifactId>unboundid-ldapsdk</artifactId>
<version>4.0.0</version>
<scope>test</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.taglibs/taglibs-standard-spec -->
<dependency>
<groupId>org.apache.taglibs</groupId>
<artifactId>taglibs-standard-spec</artifactId>
<version>1.2.5</version>
</dependency>
<dependency>
<groupId>org.apache.tomcat</groupId>
<artifactId>jasper</artifactId>
<version>6.0.32</version>
</dependency>
</dependencies>
</project>
的web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
<display-name>cashvariance</display-name>
<servlet>
<servlet-name>jsp</servlet-name>
<servlet-class>org.apache.jasper.servlet.JspServlet</servlet-class>
<init-param>
<param-name>pageCheckSeconds</param-name>
<param-value>-1</param-value>
</init-param>
<init-param>
<param-name>debug</param-name>
<param-value>true</param-value>
</init-param>
<init-param>
<param-name>keepgenerated</param-name>
<param-value>true</param-value>
</init-param>
<load-on-startup>0</load-on-startup>
</servlet>
<servlet>
<servlet-name>HelloWorldServlet</servlet-name>
<servlet-class>HelloWorldServlet</servlet-class>
</servlet>
<servlet>
<servlet-name>CashVarianceController</servlet-name>
<servlet-class>cashvariance.controller.CashVarianceServlet</servlet-class>
</servlet>
<servlet>
<servlet-name>DropDownController</servlet-name>
<servlet-class>cashvariance.controller.CashVarianceServletForDropDown</servlet-class>
</servlet>
<servlet>
<servlet-name>ManageRPAController</servlet-name>
<servlet-class>cashvariance.controller.ManageRPAServlet</servlet-class>
</servlet>
<servlet>
<servlet-name>AddRPAController</servlet-name>
<servlet-class>cashvariance.controller.AddRPAServlet</servlet-class>
</servlet>
<servlet>
<servlet-name>UpdateDeleteController</servlet-name>
<servlet-class>cashvariance.controller.UpdateDeleteServlet</servlet-class>
</servlet>
<servlet>
<servlet-name>DataDumpController</servlet-name>
<servlet-class>cashvariance.controller.DataDumpServlet</servlet-class>
</servlet>
<servlet>
<servlet-name>Main</servlet-name>
<servlet-class>cashvariance.controller.LoginController</servlet-class>
</servlet>
<servlet>
<servlet-name>SnoopServlet</servlet-name>
<servlet-class>SnoopServlet</servlet-class>
</servlet>
<servlet>
<servlet-name>logon</servlet-name>
<servlet-class>demo.log4j.servlet.LogonServlet</servlet-class>
</servlet>
<servlet>
<servlet-name>ForgotPassword</servlet-name>
<servlet-class>demo.log4j.servlet.ForgotPasswordServlet</servlet-class>
</servlet>
<servlet>
<servlet-name>Register</servlet-name>
<servlet-class>demo.log4j.servlet.RegisterServlet</servlet-class>
</servlet>
<servlet>
<servlet-name>GetComments</servlet-name>
<servlet-class>demo.log4j.servlet.GetCommentsServlet</servlet-class>
</servlet>
<servlet>
<servlet-name>log4jsetup</servlet-name>
<servlet-class>demo.log4j.servlet.Log4jSetupServlet</servlet-class>
<init-param>
<param-name>props</param-name>
<param-value>log4j.properties</param-value>
</init-param>
<init-param>
<param-name>watch</param-name>
<param-value>true</param-value>
</init-param>
<init-param>
<param-name>userDB</param-name>
<param-value>userDB.properties</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>HelloWorldServlet</servlet-name>
<url-pattern>/HelloWorldServlet</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>CashVarianceController</servlet-name>
<url-pattern>/CashVarianceController</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>DropDownController</servlet-name>
<url-pattern>/DropDownController</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>ManageRPAController</servlet-name>
<url-pattern>/ManageRPAController</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>AddRPAController</servlet-name>
<url-pattern>/AddRPAController</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>UpdateDeleteController</servlet-name>
<url-pattern>/UpdateDeleteController</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>DataDumpController</servlet-name>
<url-pattern>/DataDumpController</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>Main</servlet-name>
<url-pattern>/Main</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>SnoopServlet</servlet-name>
<url-pattern>/SnoopServlet</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>logon</servlet-name>
<url-pattern>/log4j_demo/logon</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>ForgotPassword</servlet-name>
<url-pattern>/log4j_demo/ForgotPassword</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>Register</servlet-name>
<url-pattern>/log4j_demo/Register</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>GetComments</servlet-name>
<url-pattern>/log4j_demo/GetComments</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<error-page>
<error-code>404</error-code>
<location>/jsp/error.jsp</location>
</error-page>
<!-- <welcome-file-list> -->
<!-- <welcome-file>index.html</welcome-file> -->
<!-- <welcome-file>index.htm</welcome-file> -->
<!-- <welcome-file>index.jsp</welcome-file> -->
<!-- <welcome-file>default.html</welcome-file> -->
<!-- <welcome-file>default.htm</welcome-file> -->
<!-- <welcome-file>default.jsp</welcome-file> -->
<!-- </welcome-file-list> -->
</web-app>
standalone.xml中的jsp子系统
<subsystem xmlns="urn:jboss:domain:web:2.2" default-virtual-server="default-host" native="false">
<configuration>
<jsp-configuration development="true" java-encoding="ISO8859_1"/>
</configuration>
<connector name="http" protocol="HTTP/1.1" scheme="http" socket-binding="http"/>
<virtual-server name="default-host" enable-welcome-root="true">
<alias name="localhost"/>
<alias name="example.com"/>
</virtual-server>
</subsystem>
答案 0 :(得分：1)
我不使用JBoss所以我无法告诉你在哪里解决这个问题，但StackTrace清楚地表明系统属性line.separator没有设置或无法正确检索。
来自@davis
的评论我已将该属性设置在我拥有的.properties文件中并且它有效！