Stax Provider子类型问题 - Tomcat

Question

我在Liferay中部署了一个portlet，它具有Web服务调用并且正在使用内部轴库。当调用web服务时，我收到以下错误

引起：java.util.ServiceConfigurationError：javax.xml.stream.XMLInputFactory：Provider com.ctc.wstx.stax.WstxInputFactory不是子类型

我查了各种其他帖子

• java.util.ServiceConfigurationError: javax.xml.stream.XMLInputFactory: Provider com.ctc.wstx.stax.WstxInputFactory not a subtype
• 项目清单

我分析了错误线，将其分为两部分

1. 引起：java.util.ServiceConfigurationError：javax.xml.stream.XMLInputFactory
2. 提供者com.ctc.wstx.stax.WstxInputFactory不是子类型

并得出结论，错误是由于Stax Implementation不匹配造成的。

所以我检查了lib目录，找到了以下的罐子

我看到WstxInputFactory存在于woodstox-core-asl-4.1.4中

要查看此jar添加的位置，我检查了build.gradle

buildscript {
    repositories {
        maven {
            url "https://cdn.lfrs.sl/repository.liferay.com/nexus/content/groups/public"
        }
    }

    dependencies {
        classpath group: "com.liferay", name: "com.liferay.gradle.plugins.css.builder", version: "2.0.0"
    }
}

apply plugin: "com.liferay.css.builder"

dependencies {

    def withoutServletAPI = { 
        exclude group: 'javax.servlet', module: 'servlet-api'  
    }

    compile group: "org.springframework", name: "spring-webmvc-portlet", version: "4.1.5.RELEASE"

    compileOnly group: "com.liferay.portal", name: "com.liferay.portal.kernel", version: "2.6.0"
    compileOnly group: "javax.portlet", name: "portlet-api", version: "2.0"
    compileOnly group: "javax.servlet", name: "javax.servlet-api", version: "3.0.1"
    compileOnly group: "org.osgi", name: "org.osgi.service.component.annotations", version: "1.3.0"

    compile group: "org.apache.axis", name:"axis", version: "1.4"
    compile group: "org.apache.axis2", name:"axis2-adb", version: "1.6.3", withoutServletAPI
    compile group: "org.apache.axis2", name:"axis2-transport-local", version: "1.6.3", withoutServletAPI
    compile group: "org.apache.axis2", name:"axis2-transport-http", version: "1.6.3", withoutServletAPI
    compile group: "com.google.code.gson", name:"gson", version: "2.3.1"    
    compile group: "jstl", name:"jstl", version: "1.2"
    compile group: "taglibs", name:"standard", version: "1.1.2"

    //compile group: "memberservice", name:"memberservice", version: "1.0.0"


    compileOnly group: "com.liferay.portal", name: "com.liferay.util.java", version: "2.4.0"

    //compile group: "com.sun.xml.ws", name: "jaxws-rt", version: "2.2.10"

    testCompile group: 'junit', name: 'junit', version: '4.8.1'
    testCompile group: 'org.mockito', name: 'mockito-all', version: '1.9.5'

    compile files('../../modules/memberservice/build/libs/memberservice-1.0.0.jar')

}

war {
    dependsOn buildCSS
    exclude "**/*.scss"

    filesMatching("**/.sass-cache/") {
        it.path = it.path.replace(".sass-cache/", "")
    }

    includeEmptyDirs = false
}

我检查了gradle中的依赖树，发现woodstox-core-asl-4.1.4是build2-adb-1.6.3的传递依赖，它位于build.gradle中。

显然jar中存在一些冲突导致上述错误，但我无法找到导致它的jar。我怀疑JDK 8已经有了XMLInputFactory，在我的战争中，我看到geronimo-stax-api又是一个传递依赖，可能会导致冲突。

我正在寻找实际导致问题的原因。

注意：此代码不是由我创建的。我的客户已经提供了这个代码，该代码在JBoss上的旧版Liferay（6.2）上运行，由不同的供应商创建，我们正在Tomcat上迁移到更新版本的Liferay（DXP）。

PS：我还检查了Tomcat的lib目录，也没有stax实现

Answer 1

I have a similar issue. When upgraded portlet is deployed, spring application boots up successfully. When attempted to view a portlet page, this error occurs. 

2018-08-29 14:31:50.955 ERROR [http-nio-8080-exec-8][render_portlet_jsp:131] null
java.util.ServiceConfigurationError: javax.xml.parsers.SAXParserFactory: Provider org.apache.xerces.jaxp.SAXParserFactoryImpl not a subtype
    at java.util.ServiceLoader.fail(ServiceLoader.java:239)
    at java.util.ServiceLoader.access$300(ServiceLoader.java:185)
    at java.util.ServiceLoader$LazyIterator.nextService(ServiceLoader.java:376)
    at java.util.ServiceLoader$LazyIterator.next(ServiceLoader.java:404)
    at java.util.ServiceLoader$1.next(ServiceLoader.java:480)
    at javax.xml.parsers.FactoryFinder$1.run(FactoryFinder.java:294)
    at javax.xml.parsers.FactoryFinder.findServiceProvider(FactoryFinder.java:289)
    at javax.xml.parsers.FactoryFinder.find(FactoryFinder.java:267)
    at javax.xml.parsers.SAXParserFactory.newInstance(SAXParserFactory.java:127)
    at org.apache.taglibs.standard.tlv.JstlBaseTLV.validate(JstlBaseTLV.java:194)
    at org.apache.taglibs.standard.tlv.JstlCoreTLV.validate(JstlCoreTLV.java:138)
    at org.apache.jasper.compiler.TagLibraryInfoImpl.validate(TagLibraryInfoImpl.java:957)
    at org.apache.jasper.compiler.Validator.validateXmlView(Validator.java:1929)
    at org.apache.jasper.compiler.Validator.validate(Validator.java:1896)
    at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:223)
    at org.apache.jasper.compiler.Compiler.compile(Compiler.java:451)
    at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:625)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:375)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:473)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:377)