ClassNotFoundException：org.apache.pdfbox.pdmodel.PDDocument

Question

I am getting below error during compilation. I am using Eclipse IDE & working on Ubuntu. I have added the following jar files in the build path 1) pdfbox 1.8.13 & All its dependencies 2) Commons-logging-1.2 .

Please let me know why there is error when the class is in the jar file ?

Error: java.lang.ClassNotFoundException: org.apache.pdfbox.pdmodel.PDDocument
at java.net.URLClassLoader$1.run(URLClassLoader.java:359)
at java.net.URLClassLoader$1.run(URLClassLoader.java:348)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:347)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:312)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
at com.hadoopexpert.PdfRecordReader.initialize(PdfRecordReader.java:41)
at org.apache.hadoop.mapred.MapTask$NewTrackingRecordReader.initialize(MapTask.java:521)
at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:763)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:364)
at org.apache.hadoop.mapred.Child$4.run(Child.java:255)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:421)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1190)
at org.apache.hadoop.mapred.Child.main(Child.java:249)

Answer 1

My query was resolved by doing following changes

1) Place the jar file of pdfbox in hadoop lib folder too.(make library jar available to hadoop at runtime).

2) Restart hadoop cluster.

Or

1) Make sure that your pdfbox library is available to hadoop by placing it in distributed cache.

https://stackoverflow.com/a/34179783/8956991

Answer 2

You have the class on the build path, so it compiles, but apparently you don't have it in the classpath of the running binary, which is why it doesn't run. Make sure that your application's classpath includes all the JARs that you have added (or use some build system such as Maven or Gradle which automates that for you).