Raml验证程序在javax.xml.validation.SchemaFactory.newSchema中引发错误

Question

当尝试验证espn.raml时，出现以下错误。相同的代码对于gmail.raml可以正常工作。为什么会这样呢？供您参考，我提供了结果，发现了SchemaFactory包含的jar。

$查找* .jar | xargs grep SchemaFactory.class二进制文件

axiom_1.2.11.wso2v6.jar匹配二进制文件

org.apache.openjpa_2.2.0.wso2v1.jar匹配二进制文件

solr_5.2.1.wso2v1.jar匹配

这是我得到的例外：

Caused by: java.lang.LinkageError: loader constraint violation: when resolving method "javax.xml.validation.SchemaFactory.newSchema(Ljavax/xml/transform/Source;)Ljavax/xml/validation/Schema;" the class loader (instance of org/eclipse/osgi/internal/baseadaptor/DefaultClassLoader) of the current class, org/raml/parser/rule/SchemaRule, and the class loader (instance of <bootloader>) for resolved class, javax/xml/validation/SchemaFactory, have different Class objects for the type m/Source;)Ljavax/xml/validation/Schema; used in the signature
    at org.raml.parser.rule.SchemaRule.doValidateValue(SchemaRule.java:118)
    at org.raml.parser.rule.SchemaRule.doValidateValue(SchemaRule.java:48)
    at org.raml.parser.rule.DefaultTupleRule.validateValue(DefaultTupleRule.java:108)
    at org.raml.parser.visitor.YamlDocumentValidator.onScalar(YamlDocumentValidator.java:115)
    at org.raml.parser.visitor.NodeVisitor.visitScalar(NodeVisitor.java:256)
    at org.raml.parser.visitor.NodeVisitor.visit(NodeVisitor.java:222)
    at org.raml.parser.visitor.NodeVisitor.visitResolvedNode(NodeVisitor.java:180)
    at org.raml.parser.visitor.NodeVisitor.doVisitMappingNode(NodeVisitor.java:151)
    at org.raml.parser.visitor.NodeVisitor.visitMappingNode(NodeVisitor.java:86)
    at org.raml.parser.visitor.NodeVisitor.visit(NodeVisitor.java:218)
    at org.raml.parser.visitor.NodeVisitor.visitResolvedNode(NodeVisitor.java:180)
    at org.raml.parser.visitor.NodeVisitor.doVisitMappingNode(NodeVisitor.java:151)
    at org.raml.parser.visitor.NodeVisitor.visitMappingNode(NodeVisitor.java:86)
    at org.raml.parser.visitor.NodeVisitor.visit(NodeVisitor.java:218)
    at org.raml.parser.visitor.NodeVisitor.visitResolvedNode(NodeVisitor.java:180)
    at org.raml.parser.visitor.NodeVisitor.doVisitMappingNode(NodeVisitor.java:151)
    at org.raml.parser.visitor.NodeVisitor.visitMappingNode(NodeVisitor.java:86)
    at org.raml.parser.visitor.NodeVisitor.visit(NodeVisitor.java:218)
    at org.raml.parser.visitor.NodeVisitor.visitResolvedNode(NodeVisitor.java:180)
    at org.raml.parser.visitor.NodeVisitor.doVisitMappingNode(NodeVisitor.java:151)
    at org.raml.parser.visitor.NodeVisitor.visitMappingNode(NodeVisitor.java:86)
    at org.raml.parser.visitor.NodeVisitor.visit(NodeVisitor.java:218)
    at org.raml.parser.visitor.NodeVisitor.visitResolvedNode(NodeVisitor.java:180)
    at org.raml.parser.visitor.NodeVisitor.doVisitMappingNode(NodeVisitor.java:151)
    at org.raml.parser.visitor.NodeVisitor.visitMappingNode(NodeVisitor.java:86)
    at org.raml.parser.visitor.NodeVisitor.visit(NodeVisitor.java:218)
    at org.raml.parser.visitor.NodeVisitor.visitResolvedNode(NodeVisitor.java:180)
    at org.raml.parser.visitor.NodeVisitor.doVisitMappingNode(NodeVisitor.java:151)
    at org.raml.parser.visitor.NodeVisitor.visitMappingNode(NodeVisitor.java:86)
    at org.raml.parser.visitor.NodeVisitor.visit(NodeVisitor.java:218)
    at org.raml.parser.visitor.NodeVisitor.visitResolvedNode(NodeVisitor.java:180)
    at org.raml.parser.visitor.NodeVisitor.doVisitMappingNode(NodeVisitor.java:151)
    at org.raml.parser.visitor.NodeVisitor.visitMappingNode(NodeVisitor.java:86)
    at org.raml.parser.visitor.NodeVisitor.visit(NodeVisitor.java:218)
    at org.raml.parser.visitor.NodeVisitor.visitResolvedNode(NodeVisitor.java:180)
    at org.raml.parser.visitor.NodeVisitor.doVisitMappingNode(NodeVisitor.java:151)
    at org.raml.parser.visitor.NodeVisitor.visitMappingNode(NodeVisitor.java:86)
    at org.raml.parser.visitor.NodeVisitor.visit(NodeVisitor.java:218)
    at org.raml.parser.visitor.NodeVisitor.visitResolvedNode(NodeVisitor.java:180)
    at org.raml.parser.visitor.NodeVisitor.doVisitMappingNode(NodeVisitor.java:151)
    at org.raml.parser.visitor.NodeVisitor.visitDocument(NodeVisitor.java:209)
    at org.raml.parser.visitor.YamlValidationService.validate(YamlValidationService.java:65)
    at org.raml.parser.visitor.YamlValidationService.validate(YamlValidationService.java:95)
    at org.raml.parser.visitor.YamlValidationService.validate(YamlValidationService.java:82)
    at org.raml.parser.visitor.YamlValidationService.validate(YamlValidationService.java:72)
    at org.wso2.carbon.registry.custom.extensions.handlers.utils.RAMLProcessor.isValidateRAML(RAMLProcessor.java:127)
    at org.wso2.carbon.registry.custom.extensions.handlers.utils.RAMLProcessor.processRAML(RAMLProcessor.java:79)
    at org.wso2.carbon.registry.custom.extensions.handlers.RAMLMediaTypeHandler.put(RAMLMediaTypeHandler.java:157)
    at org.wso2.carbon.registry.core.jdbc.handlers.HandlerManager.put(HandlerManager.java:2503)
    ... 78 more

Answer 1

真奇怪 运行以下命令没有问题：

RamlValidationService
  .createDefault()
  .validate("http://api.apihub.com/onpositive/api/espn-raml-api/espn.raml");

它不会引发异常，并返回一个空值List<ValidationResult>，因为此RAML文件有效。

我的环境：

Apache Maven 3.3.3
Java version: 1.8.0_60, vendor: Oracle Corporation

就我而言，javax.xml.validation.SchemaFactory由JDK本身提供。您应该争取相同的效果，即通过使用不包含此类的备用JAR（这些似乎是WSO2特定版本，其他版本可能有所不同吗？），确保没有其他库可以为您的代码贡献此类。或通过类加载器筛选（如果执行环境允许）。

编辑正如注释中所添加的，解决方法是xml-apis:xml-apis从RAML解析器中排除。因为最近的JDK提供了RAML Parser所需的东西，所以这种排除是有道理的。