TransformerFactory.newInstance（）。newTransformer（streamSource）返回null

问题描述

这怎么可能是TransformerFactory.newInstance（）。newTransformer（streamSource）返回null。根据javadoc，这是不可能的：

这里是groovy代码示例

  def is = new ClassPathResource（'xslt / MySpace-Contact.xsl'）。inputStream 
 println是
 def streamSource = new StreamSource（是）
 println streamSource 
 def factory = TransformerFactory.newInstance（ ）
 println factory 
 def tr = factory.newTransformer（streamSource）
 println tr 
  

以下是输出：

- 来自testTransformation的输出 -

java.io.BufferedInputStream @ 32999f10

javax.xml.transform.stream.StreamSource@399ed64

org.apache.xalan.processor .TransformerFactoryImpl @ 6eb04214

null

解答方案

回答我自己的问题。如果XSLT文件无效，会发生（newTransformer（Source）将返回 null ）。我认为应该向Oracle报告，以便他们更改javadoc。返回 null 仍然是可能的。

How could that be that TransformerFactory.newInstance().newTransformer(streamSource) returns null. According to javadoc this is not possible:http://download.oracle.com/javase/6/docs/api/javax/xml/transform/TransformerFactory.html#newTransformer(javax.xml.transform.Source)

here's groovy code sample

    def is = new ClassPathResource('xslt/MySpace-Contact.xsl').inputStream
    println is
    def streamSource = new StreamSource(is)
    println streamSource
    def factory = TransformerFactory.newInstance()
    println factory
    def tr = factory.newTransformer(streamSource)
    println tr

Here's the output:

--Output from testTransformation--
java.io.BufferedInputStream@32999f10
javax.xml.transform.stream.StreamSource@399ed64
org.apache.xalan.processor.TransformerFactoryImpl@6eb04214
null

解决方案

Answering my own question. If XSLT file is not valid, that will happen (newTransformer(Source) will return null). I think that should be reported to Oracle so they change the javadoc. It's still POSSIBLE that null is returned.

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