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Struts2与Struts2 Tiles：当 apache.org 关闭时，我的 web 应用程序无法启动

发布于 2024-10-18 13:07:39 字数 6311 浏览 4 评论 0原文

我正在构建一个使用tiles的Struts2 Web应用程序，但是我发现了一个非常令人沮丧的问题，如果apache.org宕机（这似乎经常发生），Web应用程序将无法启动。这是因为在其标准设置中，StrutsTilesListener 尝试加载tiles defenitions 文件，其中包含带有公共id 的DOCTYPE，该公共id 指向位于tiles.apache.org 上的DTD。

当应用程序启动时，定义文件是使用 Apache Xerces 通过 Apache Commons Digester 加载的，它尝试从tiles.apache.org 加载 DTD，但如果 apache.org 关闭，则此操作会失败，整个 Web 应用程序将无法启动。

我可以通过下载文件并将其放置在本地并在 struts 定义文件中指定新的本地位置来绕过从远程位置的下载，但是此解决方案不太可移植，因为本地保存 DTD 的位置可能在不同的设备上有所不同。一旦上传到实时环境，开发人员的机器和不同的机器就不同了，所以我必须继续编辑位置，以适应 web 应用程序运行的机器，这实在是太烦人了。

项目中没有其他 xml 文件存在此问题，包括 struts.xml 文件，该文件在 apache.org 上也有 DTD 位置，因此显然存在设置问题，Tiles 严格要求 DTD，但其他组件则不需要。有什么办法解决这个问题吗？我已经失去耐心了，我无法让这个 web 应用程序上线，因为我知道如果 apache.org 在我重新启动时关闭，那么 web 应用程序将不会恢复。

Struts 平铺防御文件Stacktrace

<?xml version="1.0" encoding="ISO-8859-1" ?>
<!DOCTYPE tiles-definitions PUBLIC
       "-//Apache Software Foundation//DTD Tiles Configuration 2.1//EN"
       "http://tiles.apache.org/dtds/tiles-config_2_1.dtd">
<tiles-definitions>
    <definition name="master" template="/tiles/templates/master.jsp">
    </definition>
    <definition name="public" extends="master">
        <put-attribute name="header" value="/tiles/templates/public/header.jsp" />
        <put-attribute name="footer" value="/tiles/templates/public/footer.jsp" />
        <put-attribute name="templateMeta" value="/tiles/templates/public/meta.jsp" />
    </definition>  
</tiles-definitions>

apache.org 关闭时

SEVERE: Exception sending context initialized event to listener instance of class org.apache.struts2.tiles.StrutsTilesListener
java.lang.IllegalStateException: Unable to instantiate container.
    at org.apache.tiles.web.startup.TilesListener.contextInitialized(TilesListener.java:60)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3972)
    at org.apache.catalina.core.StandardContext.start(StandardContext.java:4467)
    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
    at org.apache.catalina.core.StandardHost.start(StandardHost.java:785)
    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
    at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
    at org.apache.catalina.core.StandardService.start(StandardService.java:519)
    at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
    at org.apache.catalina.startup.Catalina.start(Catalina.java:581)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)
Caused by: org.apache.tiles.definition.DefinitionsFactoryException: I/O Error reading definitions.
    at org.apache.tiles.definition.digester.DigesterDefinitionsReader.read(DigesterDefinitionsReader.java:273)
    at org.apache.tiles.definition.UrlDefinitionsFactory.readDefinitions(UrlDefinitionsFactory.java:286)
    at org.apache.tiles.definition.UrlDefinitionsFactory.init(UrlDefinitionsFactory.java:130)
    at org.apache.tiles.impl.BasicTilesContainer.initializeDefinitionsFactory(BasicTilesContainer.java:406)
    at org.apache.tiles.impl.BasicTilesContainer.init(BasicTilesContainer.java:130)
    at org.apache.tiles.factory.TilesContainerFactory.initializeContainer(TilesContainerFactory.java:232)
    at org.apache.tiles.factory.TilesContainerFactory.createTilesContainer(TilesContainerFactory.java:198)
    at org.apache.tiles.factory.TilesContainerFactory.createContainer(TilesContainerFactory.java:163)
    at org.apache.tiles.web.startup.TilesListener.createContainer(TilesListener.java:90)
    at org.apache.struts2.tiles.StrutsTilesListener.createContainer(StrutsTilesListener.java:68)
    at org.apache.tiles.web.startup.TilesListener.contextInitialized(TilesListener.java:57)
    ... 15 more
Caused by: java.net.SocketException: Connection reset
    at java.net.SocketInputStream.read(Unknown Source)
    at java.io.BufferedInputStream.fill(Unknown Source)
    at java.io.BufferedInputStream.read1(Unknown Source)
    at java.io.BufferedInputStream.read(Unknown Source)
    at sun.net.www.http.HttpClient.parseHTTPHeader(Unknown Source)
    at sun.net.www.http.HttpClient.parseHTTP(Unknown Source)
    at sun.net.www.http.HttpClient.parseHTTP(Unknown Source)
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
    at org.apache.commons.digester.Digester.createInputSourceFromURL(Digester.java:2072)
    at org.apache.commons.digester.Digester.resolveEntity(Digester.java:1725)
    at com.sun.org.apache.xerces.internal.util.EntityResolverWrapper.resolveEntity(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.resolveEntityAsPerStax(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$DTDDriver.dispatch(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$DTDDriver.next(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
    at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source)
    at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source)
    at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
    at org.apache.commons.digester.Digester.parse(Digester.java:1887)
    at org.apache.tiles.definition.digester.DigesterDefinitionsReader.read(DigesterDefinitionsReader.java:267)
    ... 25 more
原文

I am building a Struts2 web application which uses tiles however I have discovered a quite frustrating problem where if apache.org is down (which seems to happen quite regularly) the web application fails to start. This is because in its standard setup the StrutsTilesListener tries to load the tiles defenitions file which includes a DOCTYPE with a public-id which points to a DTD located on tiles.apache.org.

When the application starts up the definition file is loaded using Apache Xerces via Apache Commons Digester which tries to load the DTD from tiles.apache.org but if apache.org is down then this fails and with it the whole web application wont start.

I can bypass the download from a remote location by downloading the file and placing it local and specifying the new local location in the struts definitions file, however this solution is not very portable as the location where the DTD is saved locally may be different on different developer machines and different once uploaded to a live environment so I would have to keep editing the location so suite the machine the webapp is running on which is just plain annoying.

No other xml files in the project have this problem, including the struts.xml file which also has a DTD location on apache.org so clearly there is a setup problem where Tiles is strictly requiring the DTD but other components are not. Is there any solution to this? I am running out of patience and I cannot put this webapp live knowing that if apache.org is down when I restart it the webapp wont come back up.

Struts tiles defenition file

<?xml version="1.0" encoding="ISO-8859-1" ?>
<!DOCTYPE tiles-definitions PUBLIC
       "-//Apache Software Foundation//DTD Tiles Configuration 2.1//EN"
       "http://tiles.apache.org/dtds/tiles-config_2_1.dtd">
<tiles-definitions>
    <definition name="master" template="/tiles/templates/master.jsp">
    </definition>
    <definition name="public" extends="master">
        <put-attribute name="header" value="/tiles/templates/public/header.jsp" />
        <put-attribute name="footer" value="/tiles/templates/public/footer.jsp" />
        <put-attribute name="templateMeta" value="/tiles/templates/public/meta.jsp" />
    </definition>  
</tiles-definitions>

Stacktrace when apache.org is down

SEVERE: Exception sending context initialized event to listener instance of class org.apache.struts2.tiles.StrutsTilesListener
java.lang.IllegalStateException: Unable to instantiate container.
    at org.apache.tiles.web.startup.TilesListener.contextInitialized(TilesListener.java:60)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3972)
    at org.apache.catalina.core.StandardContext.start(StandardContext.java:4467)
    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
    at org.apache.catalina.core.StandardHost.start(StandardHost.java:785)
    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
    at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
    at org.apache.catalina.core.StandardService.start(StandardService.java:519)
    at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
    at org.apache.catalina.startup.Catalina.start(Catalina.java:581)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)
Caused by: org.apache.tiles.definition.DefinitionsFactoryException: I/O Error reading definitions.
    at org.apache.tiles.definition.digester.DigesterDefinitionsReader.read(DigesterDefinitionsReader.java:273)
    at org.apache.tiles.definition.UrlDefinitionsFactory.readDefinitions(UrlDefinitionsFactory.java:286)
    at org.apache.tiles.definition.UrlDefinitionsFactory.init(UrlDefinitionsFactory.java:130)
    at org.apache.tiles.impl.BasicTilesContainer.initializeDefinitionsFactory(BasicTilesContainer.java:406)
    at org.apache.tiles.impl.BasicTilesContainer.init(BasicTilesContainer.java:130)
    at org.apache.tiles.factory.TilesContainerFactory.initializeContainer(TilesContainerFactory.java:232)
    at org.apache.tiles.factory.TilesContainerFactory.createTilesContainer(TilesContainerFactory.java:198)
    at org.apache.tiles.factory.TilesContainerFactory.createContainer(TilesContainerFactory.java:163)
    at org.apache.tiles.web.startup.TilesListener.createContainer(TilesListener.java:90)
    at org.apache.struts2.tiles.StrutsTilesListener.createContainer(StrutsTilesListener.java:68)
    at org.apache.tiles.web.startup.TilesListener.contextInitialized(TilesListener.java:57)
    ... 15 more
Caused by: java.net.SocketException: Connection reset
    at java.net.SocketInputStream.read(Unknown Source)
    at java.io.BufferedInputStream.fill(Unknown Source)
    at java.io.BufferedInputStream.read1(Unknown Source)
    at java.io.BufferedInputStream.read(Unknown Source)
    at sun.net.www.http.HttpClient.parseHTTPHeader(Unknown Source)
    at sun.net.www.http.HttpClient.parseHTTP(Unknown Source)
    at sun.net.www.http.HttpClient.parseHTTP(Unknown Source)
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
    at org.apache.commons.digester.Digester.createInputSourceFromURL(Digester.java:2072)
    at org.apache.commons.digester.Digester.resolveEntity(Digester.java:1725)
    at com.sun.org.apache.xerces.internal.util.EntityResolverWrapper.resolveEntity(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.resolveEntityAsPerStax(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$DTDDriver.dispatch(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$DTDDriver.next(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
    at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source)
    at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source)
    at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
    at org.apache.commons.digester.Digester.parse(Digester.java:1887)
    at org.apache.tiles.definition.digester.DigesterDefinitionsReader.read(DigesterDefinitionsReader.java:267)
    ... 25 more

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评论（3）

哭了丶谁疼 2024-10-25 13:07:39

我发现了这个问题，这是我的错，我在问题中所说的一切都是真的，但这只是真的，因为在tiles.xml文件中声明的DTD版本和我正在使用的tile版本之间存在不匹配。

我实际上使用的是 Tiles 2.0.6，但引用了tiles 2.1 中的DTD，因此tiles 没有引用捆绑的DTD 而是尝试下载它。

<!DOCTYPE tiles-definitions PUBLIC
       "-//Apache Software Foundation//DTD Tiles Configuration 2.1//EN"
       "http://tiles.apache.org/dtds/tiles-config_2_1.dtd">

应该是

<!DOCTYPE tiles-definitions PUBLIC
       "-//Apache Software Foundation//DTD Tiles Configuration 2.0//EN"
       "http://tiles.apache.org/dtds/tiles-config_2_0.dtd">

I have discovered the problem and it is my fault, everything I said in my question was true however it was only true because there was a mismatch between the DTD version that was declared in the tiles.xml file and the version of tiles I was using.

I am actually using Tiles 2.0.6 but was referencing the DTD from tiles 2.1 so tiles was not referencing the bundled DTD and trying to download it instead.

<!DOCTYPE tiles-definitions PUBLIC
       "-//Apache Software Foundation//DTD Tiles Configuration 2.1//EN"
       "http://tiles.apache.org/dtds/tiles-config_2_1.dtd">

Should have been

<!DOCTYPE tiles-definitions PUBLIC
       "-//Apache Software Foundation//DTD Tiles Configuration 2.0//EN"
       "http://tiles.apache.org/dtds/tiles-config_2_0.dtd">
回复 原文
海风掠过北极光 2024-10-25 13:07:39

我遇到了类似的异常，根本原因如下 -

Caused by: org.apache.tiles.definition.DefinitionsFactoryException: I/O Error reading definitions.
at org.apache.tiles.definition.digester.DigesterDefinitionsReader.read(DigesterDefinitionsReader.java:273)
at org.apache.tiles.definition.UrlDefinitionsFactory.readDefinitions(UrlDefinitionsFactory.java:286)

我正在使用 Apache Tile 3.0。

解决方案：

我下载了文件“tiles-config_3_0.dtd”并将其放置在 WEB-INF/dtd 目录中。在tiles-definition.xml 文件中进行了以下更改 -

<!DOCTYPE tiles-definitions PUBLIC
   "-//Apache Software Foundation//DTD Tiles Configuration 3.0//EN"
   "jndi:/localhost/myapp/WEB-INF/dtd/tiles-config_3_0.dtd">

它工作正常，并且此后不会查找文件的绝对路径。

I got a similar exception with below root cause -

Caused by: org.apache.tiles.definition.DefinitionsFactoryException: I/O Error reading definitions.
at org.apache.tiles.definition.digester.DigesterDefinitionsReader.read(DigesterDefinitionsReader.java:273)
at org.apache.tiles.definition.UrlDefinitionsFactory.readDefinitions(UrlDefinitionsFactory.java:286)

I am using Apache Tile 3.0.

Solution:

I downloaded the file "tiles-config_3_0.dtd" and placed it in WEB-INF/dtd dir. Made below changes in the tiles-definition.xml file -

<!DOCTYPE tiles-definitions PUBLIC
   "-//Apache Software Foundation//DTD Tiles Configuration 3.0//EN"
   "jndi:/localhost/myapp/WEB-INF/dtd/tiles-config_3_0.dtd">

It works fine and does not look for absolute path of the file thereafter.

回复 原文
落日海湾 2024-10-25 13:07:39

您可以获取 dtd 并将其放入您的应用程序中。然后更改 URL 以引用您的本地副本。

只需执行“wget”或在浏览器中查看它并将文件保存到您的项目中。

You can grab the dtd and place it in your application. Then change the URL to reference your local copy.

Just do a "wget" or view it in your browser and save the file to your project.

回复 原文
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