Propagate target exception

Closes gh-660

Author: jzheaux

core/src/main/java/org/springframework/ldap/core/support/AbstractTlsDirContextAuthenticationStrategy.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2005-2013 the original author or authors.
+ * Copyright 2005-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -15,9 +15,12 @@
  */
 package org.springframework.ldap.core.support;
 
-import org.springframework.ldap.UncategorizedLdapException;
-import org.springframework.ldap.core.DirContextProxy;
-import org.springframework.ldap.support.LdapUtils;
+import java.io.IOException;
+import java.lang.reflect.InvocationHandler;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.lang.reflect.Proxy;
+import java.util.Hashtable;
 
 import javax.naming.NamingException;
 import javax.naming.directory.DirContext;
@@ -26,11 +29,10 @@
 import javax.naming.ldap.StartTlsResponse;
 import javax.net.ssl.HostnameVerifier;
 import javax.net.ssl.SSLSocketFactory;
-import java.io.IOException;
-import java.lang.reflect.InvocationHandler;
-import java.lang.reflect.Method;
-import java.lang.reflect.Proxy;
-import java.util.Hashtable;
+
+import org.springframework.ldap.UncategorizedLdapException;
+import org.springframework.ldap.core.DirContextProxy;
+import org.springframework.ldap.support.LdapUtils;
 
 /**
  * Abstract superclass for {@link DirContextAuthenticationStrategy}
@@ -199,7 +201,11 @@ else if (method.getName().equals(GET_TARGET_CONTEXT_METHOD_NAME)) {
 				return target;
 			}
 			else {
-				return method.invoke(target, args);
+				try {
+					return method.invoke(target, args);
+				} catch (InvocationTargetException ex) {
+					throw ex.getTargetException();
+				}
 			}
 		}
 	}