小程序内的 JAXB - 未找到 package-info.class
我们有一个从小程序内部使用 JAXB 的 Web 应用程序。一切工作正常,除了首次创建 JAXBContext 时,我们在小程序控制台中看到以下记录:
Creating JAXBContext...
network: Connecting https://myserver.com/MyApp/CC.ccc with proxy=DIRECT
network: Connecting https://myserver.com/MyApp/CC.ccc with cookie "__utma=69126149.1559268128.1262793475.1265211768.1271711769.3; JSESSIONID=723072c1c4bbc2598e402b3f24a5d12f3324"
network: Cache entry not found [url: https://myserver.com/MyApp/com/comm/servlet/generated/package-info.class, version: null]
network: Connecting https://myserver.com/MyApp/com/comm/servlet/generated/package-info.class with proxy=DIRECT
network: Connecting http://myserver.com:443/ with proxy=DIRECT
network: Connecting https://myserver.com/MyApp/com/comm/servlet/generated/package-info.class with cookie "__utma=69126149.1559268128.1262793475.1265211768.1271711769.3; JSESSIONID=723072c1c4bbc2598e402b3f24a5d12f3324"
这种情况总共发生了 20 次,并且大大减慢了我们的应用程序的速度。
我正在使用“xjc”ant 任务 (com.sun.tools.xjc.XJCTask) 将我们的模式编译为 com/comm/servlet/ generated/ 包中的 Java。代码生成得很好,但没有 package-info.java。如果我手动创建此文件并编译和打包代码,则 JAR 文件中会缺少 package-info.class。
这是我的 XJC 任务:
<target name="generateJAXBSource">
<taskdef name="xjc" classname="com.sun.tools.xjc.XJCTask">
<classpath>
<fileset dir="lib/jaxb" includes="*.jar" />
</classpath>
</taskdef>
<xjc schema="resources/requests/111.xsd"
destdir="src"
package="com.comm.servlet.generated"/>
</target>
我的 XSD 如下所示:
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:xml="http://www.w3.org/XML/1998/namespace">
<xs:import namespace="http://www.w3.org/XML/1998/namespace" />
<xs:element name="InfoResponse">
<xs:complexType>
<xs:sequence>
<xs:element ref="WorkQueueItem" maxOccurs="unbounded" />
</xs:sequence>
</xs:complexType>
</xs:element>
我一整天都在谷歌上搜索,但似乎不知道如何解决这个问题。
我尝试了此处提出的解决方法确保 package-info.java 被编译:
...但没有运气。
我可以指示 JAXB 不要查找 package-info.class 吗?
如何确保手动创建的 package-info.java 最终出现在 JAR 文件中?
谢谢。
We have a web application that uses JAXB from inside an applet. Everything works fine, except when the JAXBContext is first created, we see the following logged in the applet console:
Creating JAXBContext...
network: Connecting https://myserver.com/MyApp/CC.ccc with proxy=DIRECT
network: Connecting https://myserver.com/MyApp/CC.ccc with cookie "__utma=69126149.1559268128.1262793475.1265211768.1271711769.3; JSESSIONID=723072c1c4bbc2598e402b3f24a5d12f3324"
network: Cache entry not found [url: https://myserver.com/MyApp/com/comm/servlet/generated/package-info.class, version: null]
network: Connecting https://myserver.com/MyApp/com/comm/servlet/generated/package-info.class with proxy=DIRECT
network: Connecting http://myserver.com:443/ with proxy=DIRECT
network: Connecting https://myserver.com/MyApp/com/comm/servlet/generated/package-info.class with cookie "__utma=69126149.1559268128.1262793475.1265211768.1271711769.3; JSESSIONID=723072c1c4bbc2598e402b3f24a5d12f3324"
This happens a total of 20 times, and slows down our application considerably.
I'm using the "xjc" ant task (com.sun.tools.xjc.XJCTask) to compile our schema into Java in the com/comm/servlet/generated/ package. The code gets generated fine, but there is no package-info.java. If I manually create this file and compile and package the code, the package-info.class is missing from the JAR file.
This is my XJC task:
<target name="generateJAXBSource">
<taskdef name="xjc" classname="com.sun.tools.xjc.XJCTask">
<classpath>
<fileset dir="lib/jaxb" includes="*.jar" />
</classpath>
</taskdef>
<xjc schema="resources/requests/111.xsd"
destdir="src"
package="com.comm.servlet.generated"/>
</target>
My XSD looks like this:
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:xml="http://www.w3.org/XML/1998/namespace">
<xs:import namespace="http://www.w3.org/XML/1998/namespace" />
<xs:element name="InfoResponse">
<xs:complexType>
<xs:sequence>
<xs:element ref="WorkQueueItem" maxOccurs="unbounded" />
</xs:sequence>
</xs:complexType>
</xs:element>
I've been googling all day but can't seem to figure out how to get around this.
I tried the workaround proposed here to make sure package-info.java gets compiled:
... but no luck.
Can I instruct JAXB not to look for package-info.class?
How can I make sure that my manually created package-info.java ends up in the JAR file?
Thanks.
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您的 JAXB 实现正在寻找 package-info.class 来处理模型中可能存在的任何包级别注释。没有标准方法可以阻止 JAXB 实现查找包级别注释。
添加 package-info 类(与模型类在同一包中)似乎是一个合理的解决方法。
package-info 是否无法为您编译(如果是,您会收到什么错误)?或者它只是没有出现在您的 JAR 中(如果是的话,您如何构建您的 JAR)?
Your JAXB implementation is looking for package-info.class to process any package level annotations that might be present in your model. There is no standard way to prevent a JAXB implementation from looking for package level annotations.
Adding a package-info class (in the same package as your model classes) seems like a reasonable work around.
Is package-info failing to compile for you (if so what error are you getting)? Or is it just not appearing in your JAR (if so how are you building your JAR)?