Public bug reported:

After installing pdfsam, trying to merge two or more pdf files will fail
with the following error:

ERROR  [18:52:18]: Unexpected error
java.lang.NoClassDefFoundError: javax/validation/ParameterNameProvider
at 
org.hibernate.validator.HibernateValidator.createGenericConfiguration(HibernateValidator.java:33)
at 
javax.validation.Validation$GenericBootstrapImpl.configure(Validation.java:173)
at 
org.sejda.core.validation.DefaultValidationContext.<init>(DefaultValidationContext.java:41)
at 
org.sejda.core.validation.DefaultValidationContext.<init>(DefaultValidationContext.java:36)
at 
org.sejda.core.validation.DefaultValidationContext$DefaultValidationContextHolder.<clinit>(DefaultValidationContext.java:70)
at 
org.sejda.core.validation.DefaultValidationContext.getContext(DefaultValidationContext.java:50)
at 
org.sejda.core.service.DefaultTaskExecutionService.validate(DefaultTaskExecutionService.java:104)
at 
org.sejda.core.service.DefaultTaskExecutionService.validateIfRequired(DefaultTaskExecutionService.java:97)
at 
org.sejda.core.service.DefaultTaskExecutionService.execute(DefaultTaskExecutionService.java:66)
at 
org.sejda.core.service.DefaultTaskExecutionService.execute(DefaultTaskExecutionService.java:58)
at 
org.pdfsam.task.TaskExecutionController.lambda$request$0(TaskExecutionController.java:87)
at 
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at 
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: java.lang.ClassNotFoundException: 
javax.validation.ParameterNameProvider
at 
java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581)
at 
java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
... 14 common frames omitted

1)
lsb_release -rd
Description:    Ubuntu 20.04.1 LTS
Release:        20.04

2)
apt-cache policy pdfsam
pdfsam:
  Installed: 4.0.4-1
  Candidate: 4.0.4-1
  Version table:
 *** 4.0.4-1 500
        500 http://mirror.ratiokontakt.de/mirror/ubuntu focal/universe amd64 
Packages
        500 http://mirror.ratiokontakt.de/mirror/ubuntu focal/universe i386 
Packages
        100 /var/lib/dpkg/status

3) What you expected to happen: The pdf files to be merge in a new one.

4) No output but instead the program has a red exclamation icon that on
click reveals the above error has happened and that appears to be the
reason no output is produced.

** Affects: pdfsam (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1893699

Title:
  pdfsam fails to run a merge on Ubuntu 20.04 with error

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