Java 在 GWT 中导入 Gears API 时找不到 org.apache.xerces.jaxp.SAXParserFactoryImpl
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org.apache.xerces.jaxp.SAXParserFactoryImpl not found when importing Gears API in GWT
提问by Templar
I've created a GWTproject using Eclipse which was working perfectly (I was able to run it in both Hosted Mode and on Google App Engine) until I tried to import the Gears API for Google Web Toolkit. After adding the following line to my java source file:
我已经使用 Eclipse创建了一个GWT项目，该项目运行良好（我能够在托管模式和 Google App Engine 上运行它），直到我尝试为 Google Web Toolkit导入Gears API。将以下行添加到我的 java 源文件后：
import com.google.gwt.gears.client.geolocation.Geolocation;
I get the following error when I try to compile:
当我尝试编译时出现以下错误：
19-Jun-2009 3:36:09 AM com.google.apphosting.utils.jetty.JettyLogger warn
WARNING: failed com.google.apphosting.utils.jetty.DevAppEngineWebAppContext@1c7d682{/,C:\Documents and Settings\Geoff Denning\workspace\TaskPath\war}
javax.xml.parsers.FactoryConfigurationError: Provider org.apache.xerces.jaxp.SAXParserFactoryImpl not found
I've already added the gwt-gears.jar file to my \war\WEB-INF\lib directory, and I've referenced it in Eclipse as follows:
我已经将 gwt-gears.jar 文件添加到我的 \war\WEB-INF\lib 目录中，并且我已经在 Eclipse 中引用了它，如下所示：
I've even opened the gwt-gears.jar file and confirmed that org/apache/xerces/jaxp/SAXParserFactoryImpl.class does exist. Can anyone give me any pointers as to why I'm getting the above error?
我什至打开了 gwt-gears.jar 文件并确认 org/apache/xerces/jaxp/SAXParserFactoryImpl.class 确实存在。谁能给我任何关于为什么我收到上述错误的提示？
采纳答案by Templar
回答by Jon
Check that Xerces exists in:
检查 Xerces 是否存在于：
$JAVA_HOME/lib/endorsed
Sounds like a Java 5 issue. Also check the Java system property for:
听起来像是 Java 5 问题。还要检查 Java 系统属性：
javax.xml.parsers.SAXParserFactory
It should be:
它应该是：
org.apache.xerces.jaxp.SAXParserFactoryImpl
If not then that's your issue, make sure you set the system property.
如果不是，那就是你的问题，确保你设置了系统属性。
回答by Roland
This happened to me. I had conflicting JARs in my workspace. I removed one and boom it worked. The message didn't lend very well to the root of the error.
这发生在我身上。我的工作区中有冲突的 JAR。我删除了一个并繁荣它起作用了。该消息并没有很好地说明错误的根源。
回答by Alex
My SAXParserFactoryImpl problemwas caused by gwt-gadgets.jar I had in my boot class path. Removing this JAR from the boot class path solved the problem for me. Basically you have to remove any JAR containing a SAXParserFactoryImpl class from your build path (user libs).
我的SAXParserFactoryImpl 问题是由我的引导类路径中的 gwt-gadgets.jar 引起的。从引导类路径中删除这个 JAR 为我解决了这个问题。基本上，您必须从构建路径（用户库）中删除任何包含 SAXParserFactoryImpl 类的 JAR。
回答by Isaiah
Remove the $JAVA_HOME/jre/lib/jaxp.properties fixed the issue.
删除 $JAVA_HOME/jre/lib/jaxp.properties 修复了该问题。
回答by Todd Url
Take a look at Trouble with Selenium (XercesImpl) and Google App Engine. I had a similar problem with GWT / GAE (SAXParserFactoyImpl not found) and solved it by;
看看Selenium (XercesImpl) 和 Google App Engine 的麻烦。我在 GWT / GAE 上遇到了类似的问题（未找到 SAXParserFactoyImpl）并通过以下方式解决了它；
- Importing the jar to war/WEB-INF/lib
- Adding the jar to the build path
- 将 jar 导入到 war/WEB-INF/lib
- 将 jar 添加到构建路径
