实例化 Java 对象时发生异常 (ColdFusion)

Question

我不久前为adding a link to a pdf 找到了这个解决方案。如果偶尔使用它就像一个魅力（在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 不是很有经验），在尝试第二次运行此脚本（无需重新启动）时，ColdFusion 返回错误：

对象实例化异常。

实例化 Java 对象时发生异常。班上 不能是接口或抽象类。错误：''。

ColdFusion 然后指示导致错误的行似乎在：

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？我认为以某种方式创建的 java 对象在 java 中“存活”但当然不能在 CF 中存活。

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可用的服务器内存以及其他进程正在使用多少。您可能想尝试为阅读器使用RandomAccessFileOrArray 并缓冲编写器输出。看看是否有帮助。此外，请确保您正在关闭压模和输出流。

// 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 );

Answer 2

错误给出了问题。转到第一行“Caused by”：

java.lang.OutOfMemoryError: Map failed     at sun.nio.ch.FileChannelImpl.map0(Native Method) 

根本原因是您的内存不足。尝试增加 JVM 的可用内存。