maven - Jsf实现版本从Tomcat 7迁移到8时出现NullPointerException

Question

我目前使用的是 JSF 2.2.7 和 Icefaces 4.0.0 版。我的项目在 Tomcat 7 上运行，但我在尝试让它在 Tomcat 8 上运行时遇到了问题。我收到一个空指针异常，因为 icefaces 代码中的一个方法似乎在检查正在使用的 jsf 的当前版本。这总是返回 null 并且我似乎没有设置 jsf 的正确实现。堆栈跟踪如下:

java.lang.NullPointerException at org.icefaces.util.EnvUtils.isJSF22(EnvUtils.java:976) at org.icefaces.impl.context.DOMPartialViewContext.renderState(DOMPartialViewContext.java:743) at org.icefaces.impl.context.DOMPartialViewContext.processPartial(DOMPartialViewContext.java:301) at javax.faces.context.PartialViewContextWrapper.processPartial(PartialViewContextWrapper.java:219) at javax.faces.component.UIViewRoot.encodeChildren(UIViewRoot.java:1004) at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1856) at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:430) at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:133) at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:337) at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:120) at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101) at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:219) at javax.faces.webapp.FacesServlet.service(FacesServlet.java:647) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:614) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:617) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:518) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:668) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1527) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1484) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:744) Aug 04, 2015 7:50:52 AM com.sun.faces.application.view.FaceletViewHandlingStrategy handleRenderException SEVERE: Error Rendering View[/pages/Ports.xhtml] java.lang.NullPointerException at org.icefaces.util.EnvUtils.isJSF22(EnvUtils.java:976) at org.icefaces.impl.context.DOMPartialViewContext.renderState(DOMPartialViewContext.java:743) at org.icefaces.impl.context.DOMPartialViewContext.processPartial(DOMPartialViewContext.java:301) at javax.faces.context.PartialViewContextWrapper.processPartial(PartialViewContextWrapper.java:219) at javax.faces.component.UIViewRoot.encodeChildren(UIViewRoot.java:1004) at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1856) at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:430) at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:133) at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:337) at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:120) at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101) at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:219) at javax.faces.webapp.FacesServlet.service(FacesServlet.java:647) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:614) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:617) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:518) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:668) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1527) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1484) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:744) Aug 04, 2015 7:50:52 AM com.sun.faces.context.AjaxExceptionHandlerImpl handlePartialResponseError SEVERE: java.lang.NullPointerException at org.icefaces.util.EnvUtils.isJSF22(EnvUtils.java:976) at org.icefaces.impl.context.DOMPartialViewContext.renderState(DOMPartialViewContext.java:743) at org.icefaces.impl.context.DOMPartialViewContext.processPartial(DOMPartialViewContext.java:301) at javax.faces.context.PartialViewContextWrapper.processPartial(PartialViewContextWrapper.java:219) at javax.faces.component.UIViewRoot.encodeChildren(UIViewRoot.java:1004) at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1856) at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:430) at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:133) at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:337) at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:120) at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101) at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:219) at javax.faces.webapp.FacesServlet.service(FacesServlet.java:647) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:614) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:617) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:518) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:668) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1527) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1484) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:744)

仔细检查后，getImplementationVersion() 方法似乎返回 null:

/**
 * Determine whether the current JSF implementation is version 2.2
 * @return true if JSF implementation is 2.2
 */
public static boolean isJSF22() {
    return FacesContext.class.getPackage().getImplementationVersion().startsWith("2.2");
}

这是我的带有 IceFaces 和 JSF 依赖项的 pom.xml。我不确定我的 JSF 实现是如何设置的。

    <?xml version="1.0"?>
     <project
        xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"
        xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
        <modelVersion>4.0.0</modelVersion>
        <groupId>oag.com.reference</groupId>
        <artifactId>web</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <name>ReferenceDataWeb </name>
        <packaging>war</packaging>
        <description>Reference data web project.</description>


    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <sonar.core.codeCoveragePlugin>jacoco</sonar.core.codeCoveragePlugin>
        <sonar.dynamicAnalysis>reuseReports</sonar.dynamicAnalysis>
    </properties>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-jar-plugin</artifactId>
                <version>2.6</version>
                <configuration>
                    <archive>
                        <manifest>
                            <addClasspath>true</addClasspath>
                            <addDefaultImplementationEntries>true</addDefaultImplementationEntries>
                        </manifest>
                    </archive>
                </configuration>
            </plugin>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.7</source>
                    <target>1.7</target>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.jacoco</groupId>
                <artifactId>jacoco-maven-plugin</artifactId>
                <version>0.7.0.201403182114</version>
                <executions>
                    <execution>
                        <goals>
                            <goal>prepare-agent</goal>
                        </goals>
                    </execution>
                </executions>
                <configuration>
                    <destFile>${sonar.jacoco.reportPath}</destFile>
                </configuration>
            </plugin>
        </plugins>
    </build>

    <dependencies>
        <dependency>
            <groupId>org.icefaces</groupId>
            <artifactId>icefaces</artifactId>
            <version>4.0.0</version>
        </dependency>
        <dependency>
            <groupId>org.icefaces</groupId>
            <artifactId>icefaces-ace</artifactId>
            <version>4.0.0</version>
        </dependency>

        <dependency>
            <groupId>org.icepush</groupId>
            <artifactId>icepush</artifactId>
            <version>4.0.0</version>
        </dependency>
        <dependency>
            <groupId>org.icefaces</groupId>
            <artifactId>icefaces-compat</artifactId>
            <version>3.3.0</version>
            <type>pom</type>
        </dependency>

        <dependency>
            <groupId>com.oag.reference</groupId>
            <artifactId>business</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>

        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>3.7</version>
        </dependency>

        <dependency>
            <groupId>org.icefaces.ace-themes</groupId>
            <artifactId>ace-cupertino</artifactId>
            <version>4.0.0</version>
        </dependency>

        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.0.1</version>
            <scope>provided</scope>
        </dependency>

    </dependencies>
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>com.sun.faces</groupId>
                <artifactId>jsf-api</artifactId>
                <version>2.2.7</version>
            </dependency>
            <dependency>
                <groupId>com.sun.faces</groupId>
                <artifactId>jsf-impl</artifactId>
                <version>2.2.7</version>
            </dependency>
        </dependencies>

    </dependencyManagement>

 </project>

这是在我的 war 文件 WEB-INF/lib 文件夹中创建的 jar 文件的完整列表:

ace-cupertino-4.0.0.jar
activation-1.1.jar business-0.0.1-SNAPSHOT.jar
common-0.0.1-SNAPSHOT.jar commons-beanutils-1.8.0.jar
commons-logging-1.1.jar database-0.0.1-SNAPSHOT.jar
db2jcc4-1.0.0.jar
hamcrest-core-1.1.jar icefaces-4.0.0.jar icefaces-ace-4.0.0.jar
icepush-4.0.0.jar javax.faces-2.2.7.jar
jstl-1.2.jar junit-4.9.jar
mail-1.4.1.jar mockito-all-1.9.5.jar
poi-3.7.jar

查看 javax.faces-2.2.7.jar 和 META-INF/MANIFEST.MF，我可以看到实现版本设置为 2.2.7。所以我不知道在运行时被 icefaces 代码引用时，实现版本是如何为空的。

有人可以帮忙吗？

谢谢 - 查看更多信息:http://www.icesoft.org/JForum/posts/list/22974.page#80376

Answer 1

这很可能是由于手头有错误的上下文类加载器的错误引起的，该错误已根据 issue 3341 在 Mojarra 2.2.9 中修复。 .

至少升级到 Mojarra 2.2.9(目前最新的是 2.2.12)应该可以解决您的问题。