It should be thread-safe. To me it looks like a class loader problem
(NoClassDefFoundError), sadly this is an unknown territory for me.
Here's an interesting answer on this topic, although it has 0 upvotes
https://stackoverflow.com/a/32478934/535646
Tilman
Am 09.04.2021 um 03:33 schrieb Lachlan Deck:
Thanks Andreas,
That’s an interesting idea.
So are you suggesting that if, say, two parallel/concurrent threads are
attempting to load the same document (or same effective document—as we’re
passing a byte array into PDDocument.load()) that this could be the cause?
i.e., is PDDocument.load not thread-safe?
Cheers,
Lachlan
On 8 Apr 2021, at 4:18 pm, Andreas Lehmkuehler <andr...@lehmi.de> wrote:
Hi,
could be an issue with the static initialization of PDDocument due to the
java.util.concurrent.ExecutionException but this is just a wild guess.
We need a test case to reproduce this but I'm afraid that isn't that easy as
concurrency issues are likely not deterministic. But maybe someone comes up
with an idea or better a test case.
Andreas
Am 07.04.21 um 12:43 schrieb Lachlan Deck:
Hi all,
We’re periodically seeing the above exception in a spring-boot api using PDFBox
2.0.21.
When that occurs the only remedy appears to be restarting the api, after which
it hums along fine for a day and then hits this error again.
We’re producing pdfs with jasper (plus taking some optional custom pdfs), then
using PDFBox to overlay or stitch things together into a final pdf.
Does anyone know what might cause this to happen, and if it’s potentially fixed
by the recent 2.0.23 release?
our.springboot.api.exception.RenderException: failed to render a template
at our.springboot.api.Rendering...
at java.base/java.util.stream.ReferencePipeline$3$1.accept(Unknown
Source)
at
java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(Unknown
Source)
at java.base/java.util.stream.AbstractPipeline.copyInto(Unknown Source)
at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(Unknown
Source)
at
java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(Unknown Source)
at java.base/java.util.stream.AbstractPipeline.evaluate(Unknown Source)
at java.base/java.util.stream.ReferencePipeline.collect(Unknown Source)
...
at jdk.internal.reflect.GeneratedMethodAccessor193.invoke(Unknown
Source)
at
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown
Source)
at java.base/java.lang.reflect.Method.invoke(Unknown Source)
at
org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190)
at
org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138)
at
org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:105)
at
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:878)
at
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:792)
at
org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
at
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040)
at
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943)
at
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
at
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:652)
at
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:733)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at brave.servlet.TracingFilter.doFilter(TracingFilter.java:68)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at
org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
at
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at
org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
at
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at brave.servlet.TracingFilter.doFilter(TracingFilter.java:87)
at
org.springframework.cloud.sleuth.instrument.web.LazyTracingFilter.doFilter(TraceWebServletAutoConfiguration.java:139)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at
org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:93)
at
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
at
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at
org.cloudfoundry.router.ClientCertificateMapper.doFilter(ClientCertificateMapper.java:79)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
at
org.apache.catalina.valves.RemoteIpValve.invoke(RemoteIpValve.java:747)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
at
org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373)
at
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
at
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)
at
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1589)
at
org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown
Source)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown
Source)
at
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.base/java.lang.Thread.run(Unknown Source)
Caused by: java.util.concurrent.ExecutionException:
java.lang.NoClassDefFoundError: Could not initialize class
org.apache.pdfbox.pdmodel.PDDocument
at java.base/java.util.concurrent.FutureTask.report(Unknown Source)
at java.base/java.util.concurrent.FutureTask.get(Unknown Source)
at our.springboot.api.v3.service.FooBar
... 76 common frames omitted
Caused by: java.lang.NoClassDefFoundError: Could not initialize class
org.apache.pdfbox.pdmodel.PDDocument
at
our.springboot.api.domain.PDDocumentLoader.load(PDDocumentLoader.java:14)
…
at
org.springframework.cloud.sleuth.instrument.async.TraceCallable.call(TraceCallable.java:71)
at java.base/java.util.concurrent.FutureTask.run(Unknown Source)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown
Source)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown
Source)
... 1 common frames omitted
Kind regards,
Lachlan Deck
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