jiazhai opened a new pull request #7453:
URL: https://github.com/apache/pulsar/pull/7453


   ### Motivation
   
   shade bouncy castle will cause some signature errors, this PR tries to 
remove the bouncy castle shaded module.
   
   Here is the related error stack:
   ```
   10:01:34.257 [pulsar-client-io-33-1] ERROR 
org.apache.pulsar.client.impl.ConsumerImpl - MessageCryptoBc may not included 
in the jar. e:
   java.lang.SecurityException: JCE cannot authenticate the provider BC
        at javax.crypto.Cipher.getInstance(Cipher.java:657) ~[?:1.8.0_121]
        at javax.crypto.Cipher.getInstance(Cipher.java:596) ~[?:1.8.0_121]
        at 
org.apache.pulsar.client.impl.crypto.MessageCryptoBc.<init>(MessageCryptoBc.java:147)
 ~[classes/:?]
        at 
org.apache.pulsar.client.impl.ConsumerImpl.<init>(ConsumerImpl.java:270) 
~[classes/:?]
        at 
org.apache.pulsar.client.impl.ConsumerImpl.newConsumerImpl(ConsumerImpl.java:209)
 ~[classes/:?]
        at 
org.apache.pulsar.client.impl.PulsarClientImpl.lambda$doSingleTopicSubscribeAsync$5(PulsarClientImpl.java:364)
 ~[classes/:?]
        at 
java.util.concurrent.CompletableFuture.uniAccept(CompletableFuture.java:656) 
~[?:1.8.0_131]
        at 
java.util.concurrent.CompletableFuture$UniAccept.tryFire(CompletableFuture.java:632)
 ~[?:1.8.0_131]
   ...
   
   Caused by: java.util.jar.JarException: 
file:/Users/jia/.m2/repository/org/apache/pulsar/bouncy-castle-bc-shaded/2.7.0-SNAPSHOT/bouncy-castle-bc-shaded-2.7.0-SNAPSHOT.jar
 has unsigned entries - org/bouncycastle/cert/AttributeCertificateHolder.class
        at javax.crypto.JarVerifier.verifySingleJar(JarVerifier.java:500) 
~[?:1.8.0_121]
        at javax.crypto.JarVerifier.verifyJars(JarVerifier.java:361) 
~[?:1.8.0_121]
        at javax.crypto.JarVerifier.verify(JarVerifier.java:289) ~[?:1.8.0_121]
        at javax.crypto.JceSecurity.verifyProviderJar(JceSecurity.java:159) 
~[?:1.8.0_121]
        at javax.crypto.JceSecurity.getVerificationResult(JceSecurity.java:185) 
~[?:1.8.0_121]
        at javax.crypto.Cipher.getInstance(Cipher.java:653) ~[?:1.8.0_121]
   ```
   
   ### Modifications
   
   - Remove bouncy castle shaded module.
   - enhance test case to identify this error.
   
   ### Verifying this change
   
   ut passed.
   
   ### documentation
   put doc changes in a separate PR #7454. so it is easier for the release 
manager to cherry-pick this PR.


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