SWS-613 - Jaxp13XPathTemplate uses thread-unsafe XPathFactory as field

Author: poutsma

core/src/main/java/org/springframework/ws/server/endpoint/adapter/XPathParamAnnotationMethodEndpointAdapter.java

@@ -41,7 +41,7 @@
 import org.w3c.dom.NodeList;
 
 /**
- * Adapter that supports endpoint methods that use marshalling. Supports methods with the following signature:
+ * Adapter that supports endpoint methods that use XPath expressions. Supports methods with the following signature:
  * <pre>
  * void handleMyMessage(@XPathParam("/root/child/text")String param);
  * </pre>
@@ -83,7 +83,7 @@ protected boolean supportsInternal(MethodEndpoint methodEndpoint) {
         }
         Class<?>[] parameterTypes = method.getParameterTypes();
         for (int i = 0; i < parameterTypes.length; i++) {
-            if (getXPathParamAnnotation(method, i) == null || !isSuportedType(parameterTypes[i])) {
+            if (getXPathParamAnnotation(method, i) == null || !isSupportedType(parameterTypes[i])) {
                 return false;
             }
         }
@@ -100,7 +100,7 @@ private XPathParam getXPathParamAnnotation(Method method, int paramIdx) {
         return null;
     }
 
-    private boolean isSuportedType(Class<?> clazz) {
+    private boolean isSupportedType(Class<?> clazz) {
         return Boolean.class.isAssignableFrom(clazz) || Boolean.TYPE.isAssignableFrom(clazz) ||
                 Double.class.isAssignableFrom(clazz) || Double.TYPE.isAssignableFrom(clazz) ||
                 Node.class.isAssignableFrom(clazz) || NodeList.class.isAssignableFrom(clazz) ||
@@ -151,7 +151,7 @@ else if (String.class.isAssignableFrom(parameterTypes[i])) {
         return args;
     }
 
-    private XPath createXPath() {
+    private synchronized XPath createXPath() {
         XPath xpath = xpathFactory.newXPath();
         if (namespaces != null) {
             SimpleNamespaceContext namespaceContext = new SimpleNamespaceContext();

xml/src/main/java/org/springframework/xml/xpath/Jaxp13XPathExpressionFactory.java

@@ -40,11 +40,7 @@
  */
 abstract class Jaxp13XPathExpressionFactory {
 
-    private static XPathFactory xpathFactory;
-
-    static {
-        xpathFactory = XPathFactory.newInstance();
-    }
+    private static XPathFactory xpathFactory = XPathFactory.newInstance();
 
     /**
      * Creates a JAXP 1.3 <code>XPathExpression</code> from the given string expression.
@@ -55,7 +51,7 @@ abstract class Jaxp13XPathExpressionFactory {
      */
     static XPathExpression createXPathExpression(String expression) {
         try {
-            XPath xpath = xpathFactory.newXPath();
+            XPath xpath = createXPath();
             javax.xml.xpath.XPathExpression xpathExpression = xpath.compile(expression);
             return new Jaxp13XPathExpression(xpathExpression);
         }
@@ -75,7 +71,7 @@ static XPathExpression createXPathExpression(String expression) {
      */
     public static XPathExpression createXPathExpression(String expression, Map<String, String> namespaces) {
         try {
-            XPath xpath = xpathFactory.newXPath();
+            XPath xpath = createXPath();
             SimpleNamespaceContext namespaceContext = new SimpleNamespaceContext();
             namespaceContext.setBindings(namespaces);
             xpath.setNamespaceContext(namespaceContext);
@@ -88,6 +84,11 @@ public static XPathExpression createXPathExpression(String expression, Map<Strin
         }
     }
 
+    private static synchronized XPath createXPath() {
+        return xpathFactory.newXPath();
+    }
+    
+
     /** JAXP 1.3 implementation of the <code>XPathExpression</code> interface. */
     private static class Jaxp13XPathExpression implements XPathExpression {
 

xml/src/main/java/org/springframework/xml/xpath/Jaxp13XPathTemplate.java

@@ -121,7 +121,7 @@ public <T> List<T> evaluate(String expression, Source context, NodeMapper<T> nod
     }
 
     private Object evaluate(String expression, Source context, QName returnType) throws XPathException {
-        XPath xpath = xpathFactory.newXPath();
+        XPath xpath = createXPath();
         if (getNamespaces() != null && !getNamespaces().isEmpty()) {
             SimpleNamespaceContext namespaceContext = new SimpleNamespaceContext();
             namespaceContext.setBindings(getNamespaces());
@@ -166,4 +166,9 @@ else if (streamSource.getReader() != null) {
         }
     }
 
+    private synchronized XPath createXPath() {
+        return xpathFactory.newXPath();
+    }
+
+
 }