Hello!
I'm working on some code to do verification on PDFs using GAE's Conversion
API. Currently, I'm getting a null pointer error when running
"ConversionResult result = service.convert(conv);". I've tried to copy the
code included in the tutorial (
https://developers.google.com/appengine/docs/java/conversion/overview), but
I had to mess around with getting the Asset object from the BlobStore. I've
pasted the code and stack trace below; any ideas what might be wrong? I've
tried doing a try... catch, but that simply causes the method to fail
quietly. Furthermore, I can't use the built-in error code method, as the
ConversionResult object isn't created. Thank you for the help!
Will
public static void parse(String key, BlobKey bkey) throws IOException {
BlobstoreInputStream in = new BlobstoreInputStream(bkey);
byte[] attachmentData = IOUtils.toByteArray(in);
in.read(attachmentData);
System.out.println(attachmentData.toString());
System.out.println(attachmentData.length);
System.out.println("parse(): blob fetched");
//Prep for conversion
Asset fileAsset = new Asset("application/pdf", attachmentData);
System.out.println(fileAsset.getData().toString());
Document pdfDoc = new Document(fileAsset);
ConversionOptions options = ConversionOptions.Builder
.withOcrInputLanguage("en");
Conversion conv = new Conversion(pdfDoc, "text/plain", options);
if (conv.equals(null))
System.out.println("Conversion is null!");
// Actual conversion (takes a while!)
ConversionService service = ConversionServiceFactory.getConversionService();
if (service.equals(null))
System.out.println("Service is null!");
// Fails below!!
// ¯\(°_o)/¯
ConversionResult result = service.convert(conv);
ConversionErrorCode err = result.getErrorCode();
System.out.println(err.toString());
// Check for success, return conversion as String
System.out.println("parse(): 7");
if (result.success()) {
System.out.println("parse(): 8");
// Usually, there will only be 1 asset, but running it through a for loop
to be sure
System.out.println("parse(): 9");
for (Asset asset : result.getOutputDoc().getAssets()) {
System.out.println("parse(): 10");
String text = new String(asset.getData());
System.out.println("parse(): 11");
System.out.println(text);
}
}
else { //PDF not converted
System.out.println("Error: PDF not converted");
// Maybe add more error handling
}
}
Aug 20, 2012 3:10:55 PM com.google.apphosting.utils.jetty.JettyLogger warn
WARNING: /verifyPDF.jsp
java.lang.NullPointerException
at
com.google.appengine.api.conversion.ConversionServicePb$AssetInfo$Builder.setName(ConversionServicePb.java:886)
at
com.google.appengine.api.conversion.AssetProtoConverter.doForward(AssetProtoConverter.java:30)
at
com.google.appengine.api.conversion.AssetProtoConverter.doForward(AssetProtoConverter.java:17)
at
com.google.appengine.repackaged.com.google.common.base.Converter.convert(Converter.java:52)
at
com.google.appengine.api.conversion.DocumentProtoConverter.doForward(DocumentProtoConverter.java:33)
at
com.google.appengine.api.conversion.DocumentProtoConverter.doForward(DocumentProtoConverter.java:18)
at
com.google.appengine.repackaged.com.google.common.base.Converter.convert(Converter.java:52)
at
com.google.appengine.api.conversion.ConversionProtoConverter.doForward(ConversionProtoConverter.java:38)
at
com.google.appengine.api.conversion.ConversionProtoConverter.doForward(ConversionProtoConverter.java:16)
at
com.google.appengine.repackaged.com.google.common.base.Converter.convert(Converter.java:52)
at
com.google.appengine.api.conversion.ConversionRequestProtoConverter.doForward(ConversionRequestProtoConverter.java:40)
at
com.google.appengine.api.conversion.ConversionRequestProtoConverter.doForward(ConversionRequestProtoConverter.java:19)
at
com.google.appengine.repackaged.com.google.common.base.Converter.convert(Converter.java:52)
at
com.google.appengine.api.conversion.ConversionServiceImpl.convertAsync(ConversionServiceImpl.java:94)
at
com.google.appengine.api.conversion.ConversionServiceImpl.convert(ConversionServiceImpl.java:66)
at
com.google.appengine.api.conversion.ConversionServiceImpl.convert(ConversionServiceImpl.java:59)
at coupflipsite.PDFVerify.parse(PDFVerify.java:73)
at org.apache.jsp.verifyPDF_jsp._jspService(verifyPDF_jsp.java:65)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:377)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
at
com.google.appengine.tools.development.PrivilegedJspServlet.access$101(PrivilegedJspServlet.java:23)
at
com.google.appengine.tools.development.PrivilegedJspServlet$2.run(PrivilegedJspServlet.java:59)
at java.security.AccessController.doPrivileged(Native Method)
at
com.google.appengine.tools.development.PrivilegedJspServlet.service(PrivilegedJspServlet.java:57)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
at
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
at
com.google.appengine.tools.development.HeaderVerificationFilter.doFilter(HeaderVerificationFilter.java:35)
at
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at
com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:60)
at
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at
com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
at
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at
com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:125)
at
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at
com.google.appengine.tools.development.BackendServersFilter.doFilter(BackendServersFilter.java:97)
at
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
at
org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
at
com.google.appengine.tools.development.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:94)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at
com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:370)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:326)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
at
org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:938)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:755)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
at
org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
at
org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
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