Findings for PR https://github.com/grpc/grpc-java/pull/6805

change.java

@Override
  public X509Certificate[] getAcceptedIssuers() {
    X509Certificate[] certs;
    try {
      List<X509Certificate> trustCerts = new ArrayList<>();
      KeyStore ks = tlsOptions.getTrustedCerts();
      Enumeration<String> aliases = ks.aliases();
      while (aliases.hasMoreElements()) {
        Certificate c = ks.getCertificate(aliases.nextElement());
        if (c instanceof X509Certificate) {
          trustCerts.add((X509Certificate) c);
        }
      }
      certs = new X509Certificate[trustCerts.size()];
      for (int i = 0; i < trustCerts.size(); i++) {
        certs[i] = trustCerts.get(i);
      }
    } catch (Exception e) {
      return new X509Certificate[0];
    }
    return certs;
    // return new X509Certificate[0];
  }

failure.log

basicServerSideIntegrationTest[JDK]
java.lang.AssertionError: Didn't expect error but find error.
	at org.junit.Assert.fail(Assert.java:88)
	at io.grpc.netty.AdvancedTlsTest.makeRpcCall(AdvancedTlsTest.java:377)
	at io.grpc.netty.AdvancedTlsTest.basicServerSideIntegrationTest(AdvancedTlsTest.java:340)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
	at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
  .......