jaxws/src/java.xml.ws/share/classes/com/sun/xml/internal/ws/model/SOAPSEIModel.java

@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Oracle designates this

@@ -31,18 +31,22 @@
 import javax.jws.WebParam.Mode;
 import javax.xml.namespace.QName;
 import java.util.HashSet;
 import java.util.Iterator;
 import java.util.Set;
+import java.util.concurrent.locks.Lock;
+import java.util.concurrent.locks.ReentrantLock;
 
 /**
  * Creates SOAP specific RuntimeModel
  *
  * @author Vivek Pandey
  */
 public class SOAPSEIModel extends AbstractSEIModelImpl {
 
+        private final Lock lock = new ReentrantLock();
+
     public SOAPSEIModel(WebServiceFeatureList features) {
         super(features);
     }
 
     @Override

@@ -70,19 +74,26 @@
         }
     }
 
     public Set<QName> getKnownHeaders() {
         Set<QName> headers = new HashSet<QName>();
+
+        try{
+                lock.lock();
         for (JavaMethodImpl method : getJavaMethods()) {
             // fill in request headers
             Iterator<ParameterImpl> params = method.getRequestParameters().iterator();
             fillHeaders(params, headers, Mode.IN);
 
             // fill in response headers
             params = method.getResponseParameters().iterator();
             fillHeaders(params, headers, Mode.OUT);
         }
+        }finally
+        {
+                lock.unlock();
+         }
         return headers;
     }
 
     /**
      * @param params