问题
When trying to validate espn.raml I got the below error. Same code is working fine for gmail.raml. Why is this happening? For your reference I have included the results I found what are the jars that SchemaFactory includes.
$ find *.jar | xargs grep SchemaFactory.class Binary file
axiom_1.2.11.wso2v6.jar matches Binary file
org.apache.openjpa_2.2.0.wso2v1.jar matches Binary file
solr_5.2.1.wso2v1.jar matches
This is the exception I'm getting:
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
回答1:
This is weird. I have no problem running the following:
RamlValidationService
.createDefault()
.validate("http://api.apihub.com/onpositive/api/espn-raml-api/espn.raml");
It throws no exception and returns an empty List<ValidationResult>, as this RAML file is valid.
My environment:
Apache Maven 3.3.3
Java version: 1.8.0_60, vendor: Oracle Corporation
In my case, javax.xml.validation.SchemaFactory is provided by the JDK itself. You should strive for the same, ie make sure that no other library can contribute this class to your code, either by using alternate JARs that don't contain this class (these seem to be WSO2 specific versions, other versions may be different?) or by using classloader filtering, if the execution environment allows it.
EDIT As added in the comments, the fix was to exclude xml-apis:xml-apis from RAML Parser. This exclusion makes sense since recent JDKs provided what's needed by RAML Parser.
回答2:
Excluding xml-apis from raml-parser did the job.
<exclusion>
<groupId>xml-apis</groupId>
<artifactId>xml-apis</artifactId>
</exclusion>
Now its validating without a issue.
来源：https://stackoverflow.com/questions/32570593/raml-validator-throws-an-error-in-javax-xml-validation-schemafactory-newschema