SecurityException: JCE cannot authenticate the provider WildFlyElytron

java.lang.SecurityException: JCE cannot authenticate the provider WildFlyElytron
        at javax.crypto.JceSecurity.getInstance(JceSecurity.java:118)
        at javax.crypto.SecretKeyFactory.getInstance(SecretKeyFactory.java:244)
        at  org.wildfly.security.credential.store.impl.KeyStoreCredentialStoreTest.installWildFlyElytronProvider(KeyStoreCredentialStoreTest.java:117)
Caused  by: java.lang.SecurityException: Cannot verify  jar:file:/hudson_workspace/workspace/wildfly-elytron-unit-tests/8cc93d85/wildfly-elytron/target/classes/!/
        at javax.crypto.JarVerifier.verifySingleJar(JarVerifier.java:448)
        at javax.crypto.JarVerifier.verifyJars(JarVerifier.java:363)
        at javax.crypto.JarVerifier.verify(JarVerifier.java:289)
        at javax.crypto.JceSecurity.verifyProviderJar(JceSecurity.java:164)
        at javax.crypto.JceSecurity.getVerificationResult(JceSecurity.java:190)
        at javax.crypto.JceSecurity.getInstance(JceSecurity.java:114)
        ... 2 more
Caused  by: java.security.PrivilegedActionException:  java.io.FileNotFoundException:  /hudson_workspace/workspace/wildfly-elytron-unit-tests/8cc93d85/wildfly-elytron/target/classes  (Is a directory)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.crypto.JarVerifier.verifySingleJar(JarVerifier.java:426)
        ... 7 more
Caused  by: java.io.FileNotFoundException:  /hudson_workspace/workspace/wildfly-elytron-unit-tests/8cc93d85/wildfly-elytron/target/classes  (Is a directory)
        at java.util.zip.ZipFile.open(Native Method)
        at java.util.zip.ZipFile.<init>(ZipFile.java:225)
        at java.util.zip.ZipFile.<init>(ZipFile.java:155)
        at java.util.jar.JarFile.<init>(JarFile.java:166)
        at java.util.jar.JarFile.<init>(JarFile.java:103)
        at javax.crypto.JarVerifier$2.run(JarVerifier.java:440)
        at javax.crypto.JarVerifier$2.run(JarVerifier.java:427)
        ... 9 more