XercesImpl 与 JavaSE 6 的内部 xerces 实现冲突。两者都需要......可以做什么？

发布于 2024-09-07 01:15:56 字数 2043 浏览 13 评论 0原文

我确信我不是第一个遇到这种冲突的人。

我继承的代码执行以下操作：

org.w3c.dom.Document dom; // declaration
javax.xml.validation.Schema schema; // declaration

...
...
...

javax.xml.validation.Validator validator = schema.newValidator();
validator.validate(new DOMSource(dom));

其中 ... 代表看似不重要/不相关的代码

使用 JDK 6 编译和运行代码可以工作（并且总是有...）

最近我有过将公司其他地方编写的另一个组件集成到我的代码中。该组件绝对需要包含在 xercesImpl-2.8.1.jar 的类路径中，

我绝对需要这个第 3 方组件，但是现在运行上面的代码不再有效，我得到以下内容：

org.xml.sax.SAXParseException: cvc-elt.1: Cannot find the declaration of element 'Root'.
 at org.apache.xerces.util.ErrorHandlerWrapper.createSAXParseException(Unknown Source)
 at org.apache.xerces.util.ErrorHandlerWrapper.error(Unknown Source)
 at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
 at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
 at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
 at org.apache.xerces.impl.xs.XMLSchemaValidator.handleStartElement(Unknown Source)
 at org.apache.xerces.impl.xs.XMLSchemaValidator.startElement(Unknown Source)
 at org.apache.xerces.jaxp.validation.DOMValidatorHelper.beginNode(Unknown Source)
 at org.apache.xerces.jaxp.validation.DOMValidatorHelper.validate(Unknown Source)
 at org.apache.xerces.jaxp.validation.DOMValidatorHelper.validate(Unknown Source)
 at org.apache.xerces.jaxp.validation.ValidatorImpl.validate(Unknown Source)
 at javax.xml.validation.Validator.validate(Validator.java:127)

作为一种解决方案，我可能想以某种方式将 xercesImpl-2.8.1.jar 屏蔽在它自己的类加载器中，但没有成功，可能是由于缺乏类加载器知识，或者可能是因为它不是要走的路。关于我的环境的另一件事是，我的应用程序在 tomcat 5.5 和 6 上运行...

顺便说一下，在调试时，我注意到当我运行 dom.getImplementation()

时添加 xercesImpl-2.8.1.jar 到类路径结果是 org.apache.xerces.dom.DeferredDOMImplementationImpl@5f15c
删除它时，结果是 com.sun.org.apache.xerces.internal.dom.DeferredDOMImplementationImpl@6c6ae3

[我想，对于细心的读者来说，这并不奇怪]

有什么建议吗？

原文

I am sure that I am not the first to encounter this conflict.

The code that I have inherited does the following:

org.w3c.dom.Document dom; // declaration
javax.xml.validation.Schema schema; // declaration

...
...
...

javax.xml.validation.Validator validator = schema.newValidator();
validator.validate(new DOMSource(dom));

where the ... stands for seemingly unimportant/irrelevant code

Compiling and running the code with JDK 6 works (and always had...)

Recently I have had to integrate into my code another component written elsewhere in the company. That component absolutely requires the inclusion in the classpath of xercesImpl-2.8.1.jar

I absolutely require this 3rd party component, but now running the code above no longer works and I get the following:

org.xml.sax.SAXParseException: cvc-elt.1: Cannot find the declaration of element 'Root'.
 at org.apache.xerces.util.ErrorHandlerWrapper.createSAXParseException(Unknown Source)
 at org.apache.xerces.util.ErrorHandlerWrapper.error(Unknown Source)
 at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
 at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
 at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
 at org.apache.xerces.impl.xs.XMLSchemaValidator.handleStartElement(Unknown Source)
 at org.apache.xerces.impl.xs.XMLSchemaValidator.startElement(Unknown Source)
 at org.apache.xerces.jaxp.validation.DOMValidatorHelper.beginNode(Unknown Source)
 at org.apache.xerces.jaxp.validation.DOMValidatorHelper.validate(Unknown Source)
 at org.apache.xerces.jaxp.validation.DOMValidatorHelper.validate(Unknown Source)
 at org.apache.xerces.jaxp.validation.ValidatorImpl.validate(Unknown Source)
 at javax.xml.validation.Validator.validate(Validator.java:127)

As a solution, I have thought perhaps somehow to shield the xercesImpl-2.8.1.jar in a classloader of its own, but have not managed to do so, perhaps due to lack of classloader knowledge or perhaps because its not the way to go. One more thing about my environment, my app runs on tomcat 5.5 and 6...

by the way while debugging I have noticed that when I run dom.getImplementation()

when adding the
xercesImpl-2.8.1.jar to the
classpath the result is
org.apache.xerces.dom.DeferredDOMImplementationImpl@5f15c
when removing it the result is com.sun.org.apache.xerces.internal.dom.DeferredDOMImplementationImpl@6c6ae3

[No surprise to you careful readers I suppose]

Any suggestions?

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哑剧 2024-09-14 01:15:56

而不是使用：

// Uses first classloader-available implementation found:
//import javax.xml.validation.SchemaFactory;
SchemaFactory schemaFactory= SchemaFactory.newInstance(
    XMLConstants.W3C_XML_SCHEMA_NS_URI);

尝试使用（自 Java 1.6 起）：

// Uses org.apache.xerces.jaxp.validation.XMLSchemaFactory subclass 
//of SchemaFactory as implementation:
//import javax.xml.validation.SchemaFactory;
SchemaFactory schemaFactory= SchemaFactory.newInstance(
    XMLConstants.W3C_XML_SCHEMA_NS_URI,
    "org.apache.xerces.jaxp.validation.XMLSchemaFactory",
    null);

请参阅相关的 JavaDoc。

或者使用 META-INF/services 工程：带有示例的文章

希望它仍然对某人有所帮助。

加布里埃尔

Instead of using:

// Uses first classloader-available implementation found:
//import javax.xml.validation.SchemaFactory;
SchemaFactory schemaFactory= SchemaFactory.newInstance(
    XMLConstants.W3C_XML_SCHEMA_NS_URI);

Try using (Since Java 1.6):

// Uses org.apache.xerces.jaxp.validation.XMLSchemaFactory subclass 
//of SchemaFactory as implementation:
//import javax.xml.validation.SchemaFactory;
SchemaFactory schemaFactory= SchemaFactory.newInstance(
    XMLConstants.W3C_XML_SCHEMA_NS_URI,
    "org.apache.xerces.jaxp.validation.XMLSchemaFactory",
    null);

See the related JavaDoc.

Or use META-INF/services engineering: article with examples

Hope it still helps somebody.

Gabriel

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