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"如何从 RELAX NG 模式生成 Java 类"

[英]How to generate Java classes from RELAX NG schema

 原文  2022-02-06 08:29:37  7   0    java/ xml/ xjc/ maven-jaxb2-plugin/ relaxng

问题描述

我试图在 Java 中为OPDS目录实现自动编组和解组。 我尝试使用 Trang 生成.xsd文件，然后使用 JAXB2 maven 插件生成 Java 类，但是生成的 XML Schema 文件完全无法使用，并且 JAXB2 产生了很多错误。 是否有任何其他工具可以从 RELAX NG 模式生成 Java 类？ 还有其他选择吗？ 我究竟做错了什么？

部分 Maven 输出

$ mvn compile
[INFO] Scanning for projects...
[INFO]
[INFO] ----------------------------< net.uo1:opds >----------------------------
[INFO] Building opds 1.2
[INFO] --------------------------------[ jar ]---------------------------------
[INFO]
[INFO] --- jaxb2-maven-plugin:2.5.0:xjc (xjc) @ opds ---
[INFO] Created EpisodePath [/home/m/tmp/opds-java/target/generated-sources/jaxb/META-INF/JAXB]: true
[INFO] Ignored given or default xjbSources [/home/m/tmp/opds-java/src/main/xjb], since it is not an existent file or directory.
[ERROR] file:/home/m/tmp/opds-java/src/main/xsd/opds.xsd [106,63]
org.xml.sax.SAXParseException: derivation-ok-restriction.4.3: Error for type '#AnonType_price'.  The process contents of the wildcard in the derivation (skip) is weaker than that in the base (lax).
    at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException (ErrorHandlerWrapper.java:204)
    at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.error (ErrorHandlerWrapper.java:135)
    at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError (XMLErrorReporter.java:396)
    at com.sun.org.apache.xerces.internal.impl.xs.traversers.XSDHandler.reportSchemaErr (XSDHandler.java:4254)
    at com.sun.org.apache.xerces.internal.impl.xs.traversers.XSDHandler.reportSchemaError (XSDHandler.java:4237)
    at com.sun.org.apache.xerces.internal.impl.xs.traversers.XSDAbstractTraverser.reportSchemaError (XSDAbstractTraverser.java:866)
    at com.sun.org.apache.xerces.internal.impl.xs.traversers.XSDComplexTypeTraverser.handleComplexTypeError (XSDComplexTypeTraverser.java:1182)
    at com.sun.org.apache.xerces.internal.impl.xs.traversers.XSDComplexTypeTraverser.traverseComplexTypeDecl (XSDComplexTypeTraverser.java:341)
    at com.sun.org.apache.xerces.internal.impl.xs.traversers.XSDComplexTypeTraverser.traverseLocal (XSDComplexTypeTraverser.java:164)
    at com.sun.org.apache.xerces.internal.impl.xs.traversers.XSDElementTraverser.traverseNamedElement (XSDElementTraverser.java:392)
    at com.sun.org.apache.xerces.internal.impl.xs.traversers.XSDElementTraverser.traverseGlobal (XSDElementTraverser.java:242)
    at com.sun.org.apache.xerces.internal.impl.xs.traversers.XSDHandler.traverseSchemas (XSDHandler.java:1483)
    at com.sun.org.apache.xerces.internal.impl.xs.traversers.XSDHandler.parseSchema (XSDHandler.java:663)
    at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaLoader.loadSchema (XMLSchemaLoader.java:618)
    at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaLoader.loadGrammar (XMLSchemaLoader.java:577)
    at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaLoader.loadGrammar (XMLSchemaLoader.java:543)
    at com.sun.org.apache.xerces.internal.jaxp.validation.XMLSchemaFactory.newSchema (XMLSchemaFactory.java:281)
    at com.sun.tools.xjc.reader.xmlschema.parser.SchemaConstraintChecker.check (SchemaConstraintChecker.java:81)
    at com.sun.tools.xjc.ModelLoader.loadXMLSchema (ModelLoader.java:301)
    at com.sun.tools.xjc.ModelLoader.load (ModelLoader.java:121)
    at com.sun.tools.xjc.ModelLoader.load (ModelLoader.java:76)
    at com.sun.tools.xjc.Driver.run (Driver.java:324)
    at org.codehaus.mojo.jaxb2.javageneration.AbstractJavaGeneratorMojo.performExecution (AbstractJavaGeneratorMojo.java:475)
    at org.codehaus.mojo.jaxb2.AbstractJaxbMojo.execute (AbstractJaxbMojo.java:337)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:137)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:210)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:156)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:148)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:117)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:81)
    at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build (SingleThreadedBuilder.java:56)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:305)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)
    at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)
    at org.apache.maven.cli.MavenCli.execute (MavenCli.java:972)
    at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:293)
    at org.apache.maven.cli.MavenCli.main (MavenCli.java:196)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:77)
    at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke (Method.java:568)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:282)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:225)
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:406)
    at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:347)
[ERROR] file:/home/m/tmp/opds-java/src/main/xsd/atom.xsd [61,46]
org.xml.sax.SAXParseException: cos-nonambig: WC[##other:"http://www.w3.org/2005/Atom"] and WC[##other:"http://www.w3.org/2005/Atom"] (or elements from their substitution group) violate "Unique Particle Attribution". During validation against this schema, ambiguity would be created for those two particles.
    at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException (ErrorHandlerWrapper.java:204)
    at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.error (ErrorHandlerWrapper.java:135)
    at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError (XMLErrorReporter.java:396)
    at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError (XMLErrorReporter.java:327)
    at com.sun.org.apache.xerces.internal.impl.xs.XSConstraints.reportSchemaError (XSConstraints.java:342)
    at com.sun.org.apache.xerces.internal.impl.xs.XSConstraints.fullSchemaChecking (XSConstraints.java:499)
    at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaLoader.loadGrammar (XMLSchemaLoader.java:584)
    at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaLoader.loadGrammar (XMLSchemaLoader.java:543)
    at com.sun.org.apache.xerces.internal.jaxp.validation.XMLSchemaFactory.newSchema (XMLSchemaFactory.java:281)
    at com.sun.tools.xjc.reader.xmlschema.parser.SchemaConstraintChecker.check (SchemaConstraintChecker.java:81)
    at com.sun.tools.xjc.ModelLoader.loadXMLSchema (ModelLoader.java:301)
    at com.sun.tools.xjc.ModelLoader.load (ModelLoader.java:121)
    at com.sun.tools.xjc.ModelLoader.load (ModelLoader.java:76)
    at com.sun.tools.xjc.Driver.run (Driver.java:324)
    at org.codehaus.mojo.jaxb2.javageneration.AbstractJavaGeneratorMojo.performExecution (AbstractJavaGeneratorMojo.java:475)
    at org.codehaus.mojo.jaxb2.AbstractJaxbMojo.execute (AbstractJaxbMojo.java:337)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:137)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:210)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:156)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:148)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:117)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:81)
    at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build (SingleThreadedBuilder.java:56)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:305)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)
    at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)
    at org.apache.maven.cli.MavenCli.execute (MavenCli.java:972)
    at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:293)
    at org.apache.maven.cli.MavenCli.main (MavenCli.java:196)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:77)
    at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke (Method.java:568)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:282)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:225)
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:406)
    at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:347)
...

项目源代码在GitHub上可用。

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