java - 实例化 Java 对象 (ColdFusion) 时发生异常

Question

我找到了 adding a link to a pdf 的解决方案前一段时间。如果偶尔使用的话，它就像一个魅力(每次使用之间重新启动服务器)。我发现由于某种原因(我对 java 和 iText 不太有经验)，当尝试第二次运行此脚本(无需重新启动)时，ColdFusion 返回错误:

Object instantiation exception.

An exception occurred while instantiating a Java object. The class must not be an interface or an abstract class. Error: ''.

ColdFusion 然后指示导致错误的行似乎位于:

pdfReader = createObject("java","com.lowagie.text.pdf.PdfReader").init(inputPath);

谁对此了解更多，有解决方案或可以解释为什么会发生这种情况？我认为不知何故，创建的 java 对象在 java 中“生存”，但当然不能在 CF 中生存。

堆栈跟踪:

java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
    at coldfusion.runtime.java.JavaProxy.CreateObject(JavaProxy.java:166)
    at coldfusion.runtime.java.JavaProxy.invoke(JavaProxy.java:80)
    at coldfusion.runtime.CfJspPage._invoke(CfJspPage.java:2360)
    at cfSched_PushJobs2MultiPress32ecfm1907554548._factor16(E:\Inetpub\DashBoards\MultiPress\Sched_PushJobs2MultiPress3.cfm:549)
    at cfSched_PushJobs2MultiPress32ecfm1907554548._factor17(E:\Inetpub\DashBoards\MultiPress\Sched_PushJobs2MultiPress3.cfm:547)
    at cfSched_PushJobs2MultiPress32ecfm1907554548._factor45(E:\Inetpub\DashBoards\MultiPress\Sched_PushJobs2MultiPress3.cfm:543)
    at cfSched_PushJobs2MultiPress32ecfm1907554548._factor25(E:\Inetpub\DashBoards\MultiPress\Sched_PushJobs2MultiPress3.cfm)
    at cfSched_PushJobs2MultiPress32ecfm1907554548._factor49(E:\Inetpub\DashBoards\MultiPress\Sched_PushJobs2MultiPress3.cfm:512)
    at cfSched_PushJobs2MultiPress32ecfm1907554548._factor51(E:\Inetpub\DashBoards\MultiPress\Sched_PushJobs2MultiPress3.cfm:509)
    at cfSched_PushJobs2MultiPress32ecfm1907554548._factor53(E:\Inetpub\DashBoards\MultiPress\Sched_PushJobs2MultiPress3.cfm:461)
    at cfSched_PushJobs2MultiPress32ecfm1907554548._factor58(E:\Inetpub\DashBoards\MultiPress\Sched_PushJobs2MultiPress3.cfm:213)
    at cfSched_PushJobs2MultiPress32ecfm1907554548._factor129(E:\Inetpub\DashBoards\MultiPress\Sched_PushJobs2MultiPress3.cfm:207)
    at cfSched_PushJobs2MultiPress32ecfm1907554548._factor146(E:\Inetpub\DashBoards\MultiPress\Sched_PushJobs2MultiPress3.cfm:102)
    at cfSched_PushJobs2MultiPress32ecfm1907554548.runPage(E:\Inetpub\DashBoards\MultiPress\Sched_PushJobs2MultiPress3.cfm:1)
    at coldfusion.runtime.CfJspPage.invoke(CfJspPage.java:231)
    at coldfusion.tagext.lang.IncludeTag.doStartTag(IncludeTag.java:416)
    at coldfusion.filter.CfincludeFilter.invoke(CfincludeFilter.java:65)
    at coldfusion.filter.ApplicationFilter.invoke(ApplicationFilter.java:360)
    at coldfusion.filter.MonitoringFilter.invoke(MonitoringFilter.java:40)
    at coldfusion.filter.PathFilter.invoke(PathFilter.java:94)
    at coldfusion.filter.ExceptionFilter.invoke(ExceptionFilter.java:70)
    at coldfusion.filter.BrowserDebugFilter.invoke(BrowserDebugFilter.java:79)
    at coldfusion.filter.ClientScopePersistenceFilter.invoke(ClientScopePersistenceFilter.java:28)
    at coldfusion.filter.BrowserFilter.invoke(BrowserFilter.java:38)
    at coldfusion.filter.NoCacheFilter.invoke(NoCacheFilter.java:46)
    at coldfusion.filter.GlobalsFilter.invoke(GlobalsFilter.java:38)
    at coldfusion.filter.DatasourceFilter.invoke(DatasourceFilter.java:22)
    at coldfusion.filter.CachingFilter.invoke(CachingFilter.java:62)
    at coldfusion.CfmServlet.service(CfmServlet.java:200)
    at coldfusion.bootstrap.BootstrapServlet.service(BootstrapServlet.java:89)
    at jrun.servlet.FilterChain.doFilter(FilterChain.java:86)
    at coldfusion.monitor.event.MonitoringServletFilter.doFilter(MonitoringServletFilter.java:42)
    at coldfusion.bootstrap.BootstrapFilter.doFilter(BootstrapFilter.java:46)
    at jrun.servlet.FilterChain.doFilter(FilterChain.java:94)
    at jrun.servlet.FilterChain.service(FilterChain.java:101)
    at jrun.servlet.ServletInvoker.invoke(ServletInvoker.java:106)
    at jrun.servlet.JRunInvokerChain.invokeNext(JRunInvokerChain.java:42)
    at jrun.servlet.JRunRequestDispatcher.invoke(JRunRequestDispatcher.java:286)
    at jrun.servlet.ServletEngineService.dispatch(ServletEngineService.java:543)
    at jrun.servlet.jrpp.JRunProxyService.invokeRunnable(JRunProxyService.java:203)
    at jrunx.scheduler.ThreadPool$DownstreamMetrics.invokeRunnable(ThreadPool.java:320)
    at jrunx.scheduler.ThreadPool$ThreadThrottle.invokeRunnable(ThreadPool.java:428)
    at jrunx.scheduler.ThreadPool$UpstreamMetrics.invokeRunnable(ThreadPool.java:266)
    at jrunx.scheduler.WorkerThread.run(WorkerThread.java:66)
Caused by: java.io.IOException: Map failed
    at sun.nio.ch.FileChannelImpl.map(FileChannelImpl.java:758)
    at com.lowagie.text.pdf.MappedRandomAccessFile.init(Unknown Source)
    at com.lowagie.text.pdf.MappedRandomAccessFile.<init>(Unknown Source)
    at com.lowagie.text.pdf.RandomAccessFileOrArray.<init>(Unknown Source)
    at com.lowagie.text.pdf.RandomAccessFileOrArray.<init>(Unknown Source)
    at com.lowagie.text.pdf.PRTokeniser.<init>(Unknown Source)
    at com.lowagie.text.pdf.PdfReader.<init>(Unknown Source)
    at com.lowagie.text.pdf.PdfReader.<init>(Unknown Source)
    ... 48 more
Caused by: java.lang.OutOfMemoryError: Map failed
    at sun.nio.ch.FileChannelImpl.map0(Native Method)
    at sun.nio.ch.FileChannelImpl.map(FileChannelImpl.java:755)
    ... 55 more

Answer 1

这不是一个大文件，但很大程度上取决于有多少服务器内存可用以及其他进程正在使用多少内存。您可能想尝试使用 RandomAccessFileOrArray供读者使用，并缓冲作家的输出。看看是否有帮助。另外，请确保关闭压模和输出流。

// use random access when reading 
raf = createObject("java", "com.lowagie.text.pdf.RandomAccessFileOrArray").init(inputPath, false, true);
pdfReader = createObject("java", "com.lowagie.text.pdf.PdfReader").init( raf, javacast("null", ""));
... 
// buffer the output
fos = createObject("java", "java.io.FileOutputStream");
outStream = createObject("java", "java.io.BufferedOutputStream").init( fos.init( outputPath ) );
pdfStamper = createObject("java", "com.lowagie.text.pdf.PdfStamper").init( pdfReader, outStream );