使用xsl转换为PDF时出错

时间：2015-08-07 19:30:02

标签： java xml xslt

使用xsl将xml转换为pdf时，我遇到了一个奇怪的问题（java代码创建xml并在运行时应用xsl）。

代码部署在Jboss服务器上。执行代码时，它会因以下错误而失败

    10:50:49,068 ERROR [stderr] (http--0.0.0.0-9080-3) Caused by: java.lang.reflect.InvocationTargetException

10:50:49,068 ERROR [stderr] (http--0.0.0.0-9080-3)           at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

10:50:49,069 ERROR [stderr] (http--0.0.0.0-9080-3)           at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

....

10:50:49,070 ERROR [stderr] (http--0.0.0.0-9080-3) Caused by: java.lang.StackOverflowError

10:50:49,070 ERROR [stderr] (http--0.0.0.0-9080-3)           at sun.misc.FloatingDecimal.dtoa(FloatingDecimal.java:532)

10:50:49,070 ERROR [stderr] (http--0.0.0.0-9080-3)           at sun.misc.FloatingDecimal.<init>(FloatingDecimal.java:459)

以下是相关的Java代码

public String transformWOCFormToPDF(IDfId xmlId,String folderId,String userName)throws DfException {    
 System.out.println("Preparing...");
 DateFormat dateFormat = new SimpleDateFormat("dd-MM-yyyy");
 Date date= new Date();
 prop=readProperties();
 IDfSysObject pdfObject = (IDfSysObject)session.newObject("jh_exported_doc");
 System.out.println("object created");
 ByteArrayOutputStream pdfResult = new ByteArrayOutputStream();
 try  {
    System.out.println("in try");
    FopFactory fopFactory = FopFactory.newInstance();       
    FOUserAgent foUserAgent = fopFactory.newFOUserAgent();      
    Fop fop = fopFactory.newFop(MimeConstants.MIME_PDF,foUserAgent, pdfResult);
    System.out.println("fop object created");

    // Get the XSLT object from the docbase             
    IDfId objID = (IDfId) session.getIdByQualification("dm_document where object_name='"+ FORM_XSLT_OBJ_NAME + "'");
    System.out.println("Object ID created  "+objID.getId());
    IDfSysObject xsltObj = (IDfSysObject) session.getObject(objID);       

    // Get XSLT content as a stream
    Source xsltSrc = new StreamSource(xsltObj.getContent());
    System.out.println("xsltSrc is  --  "+xsltSrc.toString());
    // Create a new transformer for this style sheet 
    TransformerFactory factory = TransformerFactory.newInstance();
    Transformer transformer = factory.newTransformer(xsltSrc);
    transformer.setParameter("versionParam", "1.0");

    IDfSysObject xmlObject = (IDfSysObject) session.getObject(xmlId);

       // Get xml content as a stream          
       Source xmlSrc = new StreamSource(xmlObject.getContent());
       System.out.println("Fetched xml source  "+xmlSrc.toString());
    // Setup input for XSLT transformation      

    // Resulting SAX events (the generated FO) must be piped through to FOP
    Result res = new SAXResult(fop.getDefaultHandler());
    System.out.println("res is -- "+res.toString());

    // Start XSLT transformation and FOP processing
    transformer.transform(xmlSrc, res);     

    System.out.println("size of pdf"+pdfResult.size());
    //IDfSysObject pdfObject = (IDfSysObject)session.newObject("dm_document");
    System.out.println("object created");
    pdfObject.setObjectName(FORM_PDF_OBJ_NAME+"_"+dateFormat.format(date)+"_"+userName);        
    pdfObject.setContentType("pdf");        
    pdfObject.setContent(pdfResult);    

    System.out.println("setting content");
    pdfObject.link(folderId);
    pdfObject.save();       
    System.out.println("path is "+pdfObject.getObjectId().toString());

} catch (Exception e) {
    System.out.println("Inside catch block");
    e.printStackTrace();
} finally {
    try {
        pdfResult.close();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}
return pdfObject.getObjectId().getId();

}

似乎错误即将来临，因为println在此之前正在打印

transformer.transform(xmlSrc, res);

下面是xml。尽管这是动态生成的，但我已将其从日志中复制并放在此处以供参考。附件也是xslt。

<WOC_Form>
<Evaluators>
    <Evaluators>
        <department>Clinical Research</department>
        <evaluator_name>DISPNAME hod_clinicalres_user1</evaluator_name>
        <status>Accepted</status>
        <vested_interest>no</vested_interest>
        <doi_approver>N/A</doi_approver>
    </Evaluators>
    <Evaluators>
        <department>Allied Health Administration</department>
        <evaluator_name>DISPNAME hod_aha_user1</evaluator_name>
        <status>Accepted</status>
        <vested_interest>no</vested_interest>
        <doi_approver>N/A</doi_approver>
    </Evaluators>
</Evaluators>
<Attachments>
    <Attachments>
        <object_name>WOC_18-06-2015_hod_fammed_user1.pdf</object_name>
        <owner_name>DISPNAME woc_req_user1</owner_name>
        <r_creation_date>7/24/2015 11:58:09 AM</r_creation_date>
    </Attachments>
    <Attachments>
        <object_name>xCP 2.1 Sample Application - ICM 2.1.0.pdf</object_name>
        <owner_name>DISPNAME woc_buyer_user1</owner_name>
        <r_creation_date>7/24/2015 12:03:30 PM</r_creation_date>
    </Attachments>
</Attachments>
<requesting_department>Allied Health Administration</requesting_department>
<institutions>
    <institutions-value index="0">JH</institutions-value>
    <institutions-value index="1">JC</institutions-value>
    <institutions-value index="2">JR</institutions-value>
</institutions>
<vendoe_for_woc>erferewr</vendoe_for_woc>
<dh_ch_requesting_dept>DISPNAME hod_aha_user1</dh_ch_requesting_dept>
<total_waiver_of_competition>4433</total_waiver_of_competition>
<specialist_dept/>
<specialist_name/>
<is_approved_by_specialist>0</is_approved_by_specialist>
<description_of_goods_servic>dsfdsf</description_of_goods_servic>
<background>sdf</background>
<req_of_goods_or_services>sdfds</req_of_goods_or_services>
<proposals_from_vendors>sfdsf</proposals_from_vendors>
<negotiations_and_bafo>sdfsd</negotiations_and_bafo>
<calculation_of_contract_sum>ret</calculation_of_contract_sum>
<contract_period>ewte</contract_period>
<reason_request1>0</reason_request1>
<reason_request2>0</reason_request2>
<reason_request3>0</reason_request3>
<reason_request4>0</reason_request4>
<reason_request5>0</reason_request5>
<reason_request6>1</reason_request6>
<reason_request7>0</reason_request7>
<reason_request8>0</reason_request8>
<dh_ch_requesting_dept>DISPNAME hod_aha_user1</dh_ch_requesting_dept>
<dh_ch_approval_time>7/24/2015 12:00:50 PM</dh_ch_approval_time>
<specialist_name/>
<specialist_approval_time>nulldate</specialist_approval_time>
<mmd_manager_name>DISPNAME woc_mmd_mgr_user1</mmd_manager_name>
<mmd_mgr_approval_time>7/24/2015 12:07:09 PM</mmd_mgr_approval_time>
<finance_controller_name/>
<finance_controller_approval>nulldate</finance_controller_approval>

奇怪的是，整个事情在2台服务器（VM）上工作正常但在另外2台服务器（VM）上出现上述错误（每台服务器都是安装了Jboss的独立虚拟机）。所有虚拟机都是Windows，并且具有完全相同的Jboss配置。

我做了一些谷歌搜索，发现了这个问题的几个潜在原因。一个原因可能是xslt中的一些递归调用导致stackoverflow错误。但是，为什么转换在其他两个VM中起作用没有意义。但是有可能导致这种递归行为的测试数据（我无法捕获）存在差异。我在这里链接了xsl，以防论坛中的xslt专家注意到xsl出现了严重错误。

  

http://filedb.experts-exchange.com/incoming/2015/08_w32/927711/WOCFormXSLT.xsl

我发现的第二个潜在原因是可能没有足够的Java内存分配。部署此代码的Jboss具有以下内存参数

set USER_MEM_ARGS=-Xms1024m -Xmx1024m -XX:PermSize=256m -XX:MaxPermSize=256m -Xss256k -XX:+DisableExplicitGC -Xrs

设置JAVA_OPTS =％USER_MEM_ARGS％-Djboss.server.base.dir =％JBOSS_BASE_DIR％-Duser.name = dmadmin

我尝试将-Xss从256k增加到1024k和2048k，但它没有帮助

set USER_MEM_ARGS=-Xms1024m -Xmx1024m -XX:PermSize=256m -XX:MaxPermSize=256m -Xss1024k -XX:+DisableExplicitGC -Xrs

设置JAVA_OPTS =％USER_MEM_ARGS％-Djboss.server.base.dir =％JBOSS_BASE_DIR％-Duser.name = dmadmin

我只是创建了一个2页的pdf，所以它不应该需要更多的内容。此外，代码正在运行的VM，它使用默认设置，即-Xss256k。

这些VM是同一VM的克隆，因此具有完全相同的Java和Jboss版本（和设置）。我无法弄清楚可能是什么问题。它可能是与环境或与xslt代码相关的东西吗？

任何帮助都会受到高度赞赏，因为我真的碰壁了。

谢谢

1 个答案:

答案 0 :(得分：1)

堆栈跟踪在FOP中显示堆栈溢出错误：

org.apache.fop.fo.flow.table.TableColumn.toString calling
org.apache.fop.fo.properties.PercentLength.toString(PercentLength.java:121) calling
org.apache.fop.datatypes.LengthBase.toString calling TableColumn toString

这是FOP内部错误的明显标志。

这是一个bug report报告相同的错误并提到修补版本的FOP，消除了错误。你可以检查你的四台服务器 - 即使它们都是同一个VM的克隆 - 如果它们真的都运行相同版本的FOP吗？

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