Fix setCredentialsProviderClassName storing the value in the wrong field

src/main/java/com/zaxxer/hikari/HikariConfig.java

@@ -890,7 +890,7 @@ public void setCredentialsProviderClassName(String credentialsProviderClassName)
 
       try {
          this.credentialsProvider = createInstance(credentialsProviderClassName, HikariCredentialsProvider.class);
-         this.exceptionOverrideClassName = credentialsProviderClassName;
+         this.credentialsProviderClassName = credentialsProviderClassName;
       }
       catch (Exception e) {
          throw new RuntimeException("Failed to instantiate class " + credentialsProviderClassName, e);

src/test/java/com/zaxxer/hikari/HikariConfigTest.java

@@ -99,4 +99,18 @@ String getLog() {
          return log;
       }
    }
+
+   @Test
+   public void testSetCredentialsProviderClassNameSetsItsOwnField() {
+      HikariConfig config = new HikariConfig();
+      String providerClass = "com.zaxxer.hikari.pool.TestCredentials$TestCredentialsProvider";
+
+      config.setCredentialsProviderClassName(providerClass);
+
+      // the setter must record the credentials-provider class name
+      assertEquals(providerClass, config.getCredentialsProviderClassName());
+      // ...and must NOT overwrite the unrelated SQLExceptionOverride class name
+      assertNull(config.getExceptionOverrideClassName());
+   }
+
 }