Java 6: NoClassDefFoundError: com.nimbusds.jose.crypto.MACSigner (initialization failure)

Hi, I am working on a Project in Java 1.6 and server application websphere 8.5.5, I need to do an implementation with JWT and I decided to use your library because I read in your website that it works with Java 6 (https://connect2id.com/blog/jwt-with-java-6). I imported the libraries to the server, specifically WEB-INF/LIB but I am having the following problem:

Caused by: java.lang.NoClassDefFoundError: com.nimbusds.jose.crypto.MACSigner (initialization failure)
at java.lang.J9VMInternals.initialize(J9VMInternals.java:175)

Caused by: java.lang.NoClassDefFoundError: net.minidev.json.JSONAware
at java.lang.ClassLoader.defineClassImpl(Native Method)

If I added both libraries in the server, why does it have an error? Should I add anything else? Or could it be a compatibility or version error?

I drop here the dependencies and the code.

<dependency>
    <groupId>com.nimbusds</groupId>
    <artifactId>nimbus-jose-jwt</artifactId>
    <classifier>jdk16</classifier>
    <version>5.14</version>
</dependency>
<dependency>
    <groupId>net.minidev</groupId>
    <artifactId>json-smart</artifactId>
    <version>1.3.1</version>
</dependency>

protected String crearJWT( String issuer, Date exp , String secret ) throws CrearJwtMicroservicioException
{
    escribirEntradaLogDebug( this.getClass() );

    String jwt = "";

    try
    {
        JWSSigner signer = new MACSigner( secret );

        JWSHeader header = new JWSHeader( JWSAlgorithm.HS256, JOSEObjectType.JWT , null, null, null,
                null, null, null, null, null, null, null,
                null);

        JWTClaimsSet claimsSet = new JWTClaimsSet.Builder()
                .issuer( issuer )
                .expirationTime( exp )
                .build();

        SignedJWT signedJWT = new SignedJWT( header, claimsSet );
        signedJWT.sign( signer );
        jwt = signedJWT.serialize();
    }
    catch ( KeyLengthException e )
    {
        logger.error( "excepcion {} procesada : {}", e.getClass().getSimpleName(), e.getMessage() );
        throw new CrearJwtMicroservicioException( e );
    }
    catch ( JOSEException e )
    {
        logger.error( "excepcion {} procesada : {}", e.getClass().getSimpleName(), e.getMessage() );
        throw new CrearJwtMicroservicioException( e );
    }
    catch ( Exception e )
    {
        logger.error( "excepcion {} procesada : {}", e.getClass().getSimpleName(), e.getMessage() );
        throw new CrearJwtMicroservicioException( e );
    }

    escribirSalidaLogDebug( this.getClass() );
    return PropiedadesTransaccional.obtenerPropiedad( PropiedadesTransaccional.HTTP_AUTHENTICATION_SCHEME ) + jwt;
}

‌

Note: in local that works

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