Exception using PdfConvert to create png from pdf

Aspose.PDF Product Family
1

This is my first time trying to create images from pdf pages inside a web application.

I have the JAI libraries on the classpath, but get exceptions when trying to do the conversion.

Here is the code that uses the PdfConverter:

public void createPageImagesFromPdfInputStream(InputStream pdfInputStream, String folderKey) throws Exception {
PdfConverter converter = new PdfConverter();
converter.bindPdf(pdfInputStream);
converter.setStartPage(1);
converter.setEndPage(1);
converter.doConvert();

File imageFile = null;
int pageNum = 1;
while(converter.hasNextImage()){
imageFile = new File(TMP_DIR, "App/" + folderKey + "/" + folderKey + pageNum + ".png");
converter.getNextImage(imageFile.getAbsolutePath(), ImageType.PNG);
pageNum++;
}

the code throws an exception at the line "converter.doConvert(). Here is the stack trace info:

java.lang.ExceptionInInitializerError
at com.aspose.pdf.kit.pw.(Unknown Source)
at com.aspose.pdf.kit.PDFont.getEncoding(Unknown Source)
at com.aspose.pdf.kit.PDFont.encode(Unknown Source)
at com.aspose.pdf.kit.n5.a(Unknown Source)
at com.aspose.pdf.kit.f6.a(Unknown Source)
at com.aspose.pdf.kit.n5.a(Unknown Source)
at com.aspose.pdf.kit.n5.a(Unknown Source)
at com.aspose.pdf.kit.b9.a(Unknown Source)
at com.aspose.pdf.kit.n5.if(Unknown Source)
at com.aspose.pdf.kit.n5.a(Unknown Source)
at com.aspose.pdf.kit.b9.a(Unknown Source)
at com.aspose.pdf.kit.sx.fB(Unknown Source)
at com.aspose.pdf.kit.PdfConverter.doConvert(Unknown Source)
at edu.wisc.csa.convert.services.impl.ConversionServiceAsposeImpl.createPageImagesFromPdfInputStream(ConversionServiceAsposeImpl.java:138)
at edu.wisc.csa.convert.CsaConversionService.createPageImagesFromPdfInputStream(CsaConversionService.java:38)
at edu.wisc.csa.stwebapp.beans.dev.AppPickerBackingBean.resumeFileUploadedDev(AppPickerBackingBean.java:159)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.sun.el.parser.AstValue.invoke(AstValue.java:157)
at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:283)
at org.apache.myfaces.trinidadinternal.taglib.util.MethodExpressionMethodBinding.invoke(MethodExpressionMethodBinding.java:53)
at org.apache.myfaces.trinidad.component.UIXComponentBase.broadcastToMethodBinding(UIXComponentBase.java:1245)
at org.apache.myfaces.trinidad.component.UIXCommand.broadcast(UIXCommand.java:183)
at oracle.adf.view.rich.component.fragment.ContextSwitchingComponent$1.run(ContextSwitchingComponent.java:90)
at oracle.adf.view.rich.component.fragment.ContextSwitchingComponent._processPhase(ContextSwitchingComponent.java:309)
at oracle.adf.view.rich.component.fragment.ContextSwitchingComponent.broadcast(ContextSwitchingComponent.java:94)
at oracle.adf.view.rich.component.fragment.UIXInclude.broadcast(UIXInclude.java:102)
at oracle.adf.view.rich.component.fragment.ContextSwitchingComponent$1.run(ContextSwitchingComponent.java:90)
at oracle.adf.view.rich.component.fragment.ContextSwitchingComponent._processPhase(ContextSwitchingComponent.java:309)
at oracle.adf.view.rich.component.fragment.ContextSwitchingComponent.broadcast(ContextSwitchingComponent.java:94)
at oracle.adf.view.rich.component.fragment.UIXInclude.broadcast(UIXInclude.java:96)
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:475)
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:756)
at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl._invokeApplication(LifecycleImpl.java:698)
at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl._executePhase(LifecycleImpl.java:285)
at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:177)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:265)
at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)
at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:292)
at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at oracle.adf.model.servlet.ADFBindingFilter.doFilter(ADFBindingFilter.java:191)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at oracle.adfinternal.view.faces.webapp.rich.RegistrationFilter.doFilter(RegistrationFilter.java:97)
at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl$FilterListChain.doFilter(TrinidadFilterImpl.java:420)
at oracle.adfinternal.view.faces.activedata.AdsFilter.doFilter(AdsFilter.java:60)
at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl$FilterListChain.doFilter(TrinidadFilterImpl.java:420)
at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl._doFilterImpl(TrinidadFilterImpl.java:247)
at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl.doFilter(TrinidadFilterImpl.java:157)
at org.apache.myfaces.trinidad.webapp.TrinidadFilter.doFilter(TrinidadFilter.java:92)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at edu.wisc.csa.web.ApplicationSessionExpiryFilter.doFilter(ApplicationSessionExpiryFilter.java:66)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at edu.wisc.csa.web.ResponseHeaderFilter.doFilter(ResponseHeaderFilter.java:41)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at oracle.security.jps.ee.http.JpsAbsFilter$1.run(JpsAbsFilter.java:94)
at java.security.AccessController.doPrivileged(Native Method)
at oracle.security.jps.util.JpsSubject.doAsPrivileged(JpsSubject.java:313)
at oracle.security.jps.ee.util.JpsPlatformUtil.runJaasMode(JpsPlatformUtil.java:413)
at oracle.security.jps.ee.http.JpsAbsFilter.doFilter(JpsAbsFilter.java:138)
at oracle.security.jps.ee.http.JpsFilter.doFilter(JpsFilter.java:70)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at oracle.dms.wls.DMSServletFilter.doFilter(DMSServletFilter.java:326)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at weblogic.servlet.internal.RequestEventsFilter.doFilter(RequestEventsFilter.java:27)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3592)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121)
at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2202)
at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2108)
at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1432)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:201)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:173)

Caused By: java.lang.NullPointerException
at java.io.Reader.(Reader.java:61)
at java.io.InputStreamReader.(InputStreamReader.java:55)
at com.aspose.pdf.kit.rl.(Unknown Source)
at com.aspose.pdf.kit.pw.(Unknown Source)
at com.aspose.pdf.kit.PDFont.getEncoding(Unknown Source)
at com.aspose.pdf.kit.PDFont.encode(Unknown Source)
at com.aspose.pdf.kit.n5.a(Unknown Source)
at com.aspose.pdf.kit.f6.a(Unknown Source)
at com.aspose.pdf.kit.n5.a(Unknown Source)
at com.aspose.pdf.kit.n5.a(Unknown Source)
at com.aspose.pdf.kit.b9.a(Unknown Source)
at com.aspose.pdf.kit.n5.if(Unknown Source)
at com.aspose.pdf.kit.n5.a(Unknown Source)
at com.aspose.pdf.kit.b9.a(Unknown Source)
at com.aspose.pdf.kit.sx.fB(Unknown Source)
at com.aspose.pdf.kit.PdfConverter.doConvert(Unknown Source)
at edu.wisc.csa.convert.services.impl.ConversionServiceAsposeImpl.createPageImagesFromPdfInputStream(ConversionServiceAsposeImpl.java:138)
at edu.wisc.csa.convert.CsaConversionService.createPageImagesFromPdfInputStream(CsaConversionService.java:38)
at edu.wisc.csa.stwebapp.beans.dev.AppPickerBackingBean.resumeFileUploadedDev(AppPickerBackingBean.java:159)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.sun.el.parser.AstValue.invoke(AstValue.java:157)
at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:283)
at org.apache.myfaces.trinidadinternal.taglib.util.MethodExpressionMethodBinding.invoke(MethodExpressionMethodBinding.java:53)
at org.apache.myfaces.trinidad.component.UIXComponentBase.broadcastToMethodBinding(UIXComponentBase.java:1245)
at org.apache.myfaces.trinidad.component.UIXCommand.broadcast(UIXCommand.java:183)
at oracle.adf.view.rich.component.fragment.ContextSwitchingComponent$1.run(ContextSwitchingComponent.java:90)
at oracle.adf.view.rich.component.fragment.ContextSwitchingComponent._processPhase(ContextSwitchingComponent.java:309)
at oracle.adf.view.rich.component.fragment.ContextSwitchingComponent.broadcast(ContextSwitchingComponent.java:94)
at oracle.adf.view.rich.component.fragment.UIXInclude.broadcast(UIXInclude.java:102)
at oracle.adf.view.rich.component.fragment.ContextSwitchingComponent$1.run(ContextSwitchingComponent.java:90)
at oracle.adf.view.rich.component.fragment.ContextSwitchingComponent._processPhase(ContextSwitchingComponent.java:309)
at oracle.adf.view.rich.component.fragment.ContextSwitchingComponent.broadcast(ContextSwitchingComponent.java:94)
at oracle.adf.view.rich.component.fragment.UIXInclude.broadcast(UIXInclude.java:96)
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:475)
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:756)
at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl._invokeApplication(LifecycleImpl.java:698)
at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl._executePhase(LifecycleImpl.java:285)
at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:177)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:265)
at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)
at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:292)
at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at oracle.adf.model.servlet.ADFBindingFilter.doFilter(ADFBindingFilter.java:191)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at oracle.adfinternal.view.faces.webapp.rich.RegistrationFilter.doFilter(RegistrationFilter.java:97)
at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl$FilterListChain.doFilter(TrinidadFilterImpl.java:420)
at oracle.adfinternal.view.faces.activedata.AdsFilter.doFilter(AdsFilter.java:60)
at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl$FilterListChain.doFilter(TrinidadFilterImpl.java:420)
at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl._doFilterImpl(TrinidadFilterImpl.java:247)
at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl.doFilter(TrinidadFilterImpl.java:157)
at org.apache.myfaces.trinidad.webapp.TrinidadFilter.doFilter(TrinidadFilter.java:92)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at edu.wisc.csa.web.ApplicationSessionExpiryFilter.doFilter(ApplicationSessionExpiryFilter.java:66)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at edu.wisc.csa.web.ResponseHeaderFilter.doFilter(ResponseHeaderFilter.java:41)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at oracle.security.jps.ee.http.JpsAbsFilter$1.run(JpsAbsFilter.java:94)
at java.security.AccessController.doPrivileged(Native Method)
at oracle.security.jps.util.JpsSubject.doAsPrivileged(JpsSubject.java:313)
at oracle.security.jps.ee.util.JpsPlatformUtil.runJaasMode(JpsPlatformUtil.java:413)
at oracle.security.jps.ee.http.JpsAbsFilter.doFilter(JpsAbsFilter.java:138)
at oracle.security.jps.ee.http.JpsFilter.doFilter(JpsFilter.java:70)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at oracle.dms.wls.DMSServletFilter.doFilter(DMSServletFilter.java:326)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at weblogic.servlet.internal.RequestEventsFilter.doFilter(RequestEventsFilter.java:27)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3592)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121)
at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2202)
at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2108)
at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1432)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:201)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:173)

The inputSteam passed to the method is an instance of org.apache.myfaces.trinidadinternal.config.upload.UploadedFileImpl

Any ideas on how to get this working?

2

Hi Todd,

Are you using the latest version of Aspose.Pdf.Kit for Java? If not, can you please download the latest version from this link and try it at your end? If it still doesn’t resolve your issue then please share the input PDF file with us, so we could test the issue at our end.

We’re sorry for the inconvenience.
Regards,

3

I made sure that I got the current Pdf.kit (3.0.0), but got the same error message.

Attached is the file.

4

Hi Todd,

I have tested this issue using the attached sample file and a simple Java application, but couldn’t notice any problem. It looks like this issue occurs only in Weblogic/Servlet environment. We’ll test this issue in detail using your particular scenario. Please spare us some time before we get a clear understanding of the issue. You’ll be updated accordingly.

We’re sorry for the inconvenience.
Regards,

5

Hi Todd,

I have reproduced this problem at my end and logged it as PDFKITJAVA-17996 in our issue tracking system. Our team will investigate it in detail and you’ll be updated via this forum thread once it is resolved.

We’re sorry for the inconvenience.
Regards,

6

The issues you have found earlier (filed as 17996) have been fixed in this update.

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