Maven Assembly : NoClassDefFoundError

Question

I am using the maven assembly plugin to build a single JAR but I'm getting this error after running the following

java -jar target/pdfbox-printing-1.0-SNAPSHOT-jar-with-dependencies.jar

the error is

Exception in thread "main" java.lang.NoClassDefFoundError: org/bouncycastle/jce/provider/BouncyCastleProvider

this is how i compile the JAR

mvn clean compile assembly:single

here is my pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.company.printing</groupId>
  <artifactId>pdfbox-printing</artifactId>
  <packaging>jar</packaging>
  <version>1.0-SNAPSHOT</version>
  <name>pdfbox-printing</name>
  <url>http://maven.apache.org</url>
  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>org.apache.pdfbox</groupId>
      <artifactId>pdfbox</artifactId>
      <version>2.0.0</version>
    </dependency>
  </dependencies>
  <build>
    <plugins>
      <plugin>
        <artifactId>maven-assembly-plugin</artifactId>
        <executions>
          <execution>
            <phase>package</phase>
            <goals>
              <goal>single</goal>
            </goals>
          </execution>
        </executions>
        <configuration>
          <archive>
            <manifest>
              <mainClass>com.company.printing.App</mainClass>
            </manifest>
          </archive>
          <descriptorRefs>
            <descriptorRef>jar-with-dependencies</descriptorRef>
          </descriptorRefs>
        </configuration>
      </plugin>
    </plugins>
  </build>
</project>

i am actually trying to build a project that uses apache pdfbox. and i thought the maven assembly plugin will bundle all the dependencies in one JAR but why am i getting this error if its true.

BouncyCastle is an *optional* dependency (it is only needed if you have to deal with encrypted or signed PDFs); probably the `maven-assembly-plugin` does not include optional dependencies? — mkl, Nov 30 '16 at 07:42
could you check where in the code `org.bouncycastle.jce.provider.BouncyCastleProvider` is used. and if the code compiles which dependency is bringing the class in — Naman, Nov 30 '16 at 07:56
If u still want **BouncyCastle** to get added in the single jar, please download this jar and provide it as an exernal library. This will surly work out then. — dildeepak, Nov 30 '16 at 07:56
also if you need the package, you can probably add it as an dependency in your pom. — Naman, Nov 30 '16 at 07:56
2.0.0 is an outdated version. 2.0.3 is the current version. At in 2 weeks it will be 2.0.4. — Tilman Hausherr, Nov 30 '16 at 10:29
Even though the BouncyCastle dependency is shown as optional, PDFBox had references to it hardcoded in the source code. This was a bug solved in 2.0.7 https://issues.apache.org/jira/browse/PDFBOX-3831 — walen, Jun 04 '18 at 13:11

score 1 · Accepted Answer · edited Dec 01 '16 at 09:57

As the error reads, there is NoClassDefFoundError for org/bouncycastle/jce/provider/BouncyCastleProvider in which case you can use the maven library for the same by adding the following inside your <dependencies> :

<!-- https://mvnrepository.com/artifact/org.bouncycastle/bcprov-jdk16 -->
<dependency>
    <groupId>org.bouncycastle</groupId>
    <artifactId>bcprov-jdk15on</artifactId>
    <version>1.54</version>
</dependency>
<dependency>
    <groupId>org.bouncycastle</groupId>
    <artifactId>bcmail-jdk15on</artifactId>
    <version>1.54</version>
</dependency>
<dependency>
    <groupId>org.bouncycastle</groupId>
    <artifactId>bcpkix-jdk15on</artifactId>
    <version>1.54</version>
</dependency>

This shall help you import the package and use the Class required in your code.

More dependencies may be needed, see here.

1.45 is not the correct version for 2.0. See here: https://pdfbox.apache.org/2.0/dependencies.html — Tilman Hausherr, Nov 30 '16 at 10:29
@TilmanHausherr please go ahead and edit the post adding the updated version if you have used it. I just made sure for the class required has the correct dependency included. — Naman, Nov 30 '16 at 16:18

Maven Assembly : NoClassDefFoundError

1 Answers1