Question

我前段时间为adding a link to a pdf找到了这个解决方案。如果偶尔使用它，它就像魅力一样（每次使用之间重启服务器）。我发现由于某些原因（我对java和iText不是很有经验）尝试再次运行此脚本（不重启）时，ColdFusion会返回错误：

对象实例化异常。

实例化Java对象时发生异常。班级   不能是接口或抽象类。错误：''。

然后，

ColdFusion表示导致错误的行似乎在：

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

谁更了解这个，有解决方案还是可以解释为什么会这样？我认为java内部创建的java对象在某种程度上“幸存”但当然不能在CF内生存。

堆栈追踪：

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

错误给出了问题。转到第一个“引起”行：

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

根本原因是你内存不足。尝试增加JVM的可用内存。

Answer 2

这不是一个庞大的文件，但很大程度上取决于可用的服务器内存量以及其他进程使用了多少内存。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。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 );

实例化Java对象时发生异常（ColdFusion）

2 个答案: