Fix problem with websphere connection pool resetting client info

h2/src/main/org/h2/jdbc/JdbcConnection.java

@@ -30,9 +30,11 @@ import java.util.ArrayList;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.Map;
+import java.util.Objects;
 import java.util.Properties;
 import java.util.concurrent.Executor;
 import java.util.regex.Pattern;
+
 import org.h2.api.ErrorCode;
 import org.h2.command.CommandInterface;
 import org.h2.engine.ConnectionInfo;
@@ -1738,6 +1740,12 @@ public class JdbcConnection extends TraceObject
             }
             checkClosed();
             
+            // no change to property: Ignore call. This early exit fixes a problem with websphere liberty
+            // resetting the client info of a pooled connection to its initial values.
+            if (Objects.equals(value, getClientInfo(name))) {
+            	return;
+            }
+
             if (isInternalProperty(name)) {
                 throw new SQLClientInfoException(
                         "Property name '" + name + " is used internally by H2.",

h2/src/test/org/h2/test/jdbc/TestConnection.java

@@ -5,14 +5,15 @@
  */
 package org.h2.test.jdbc;
 
-import org.h2.api.ErrorCode;
-import org.h2.test.TestBase;
 import java.sql.Connection;
 import java.sql.SQLClientInfoException;
 import java.sql.SQLException;
 import java.sql.Statement;
 import java.util.Properties;
 
+import org.h2.api.ErrorCode;
+import org.h2.test.TestBase;
+
 /**
  * Tests the client info
  */
@@ -35,6 +36,7 @@ public class TestConnection extends TestBase {
         testSetSupportedClientInfoProperties();
         testSetUnsupportedClientInfoProperties();
         testSetInternalProperty();
+        testSetInternalPropertyToInitialValue();
         testSetGetSchema();
     }
 
@@ -48,6 +50,29 @@ public class TestConnection extends TestBase {
         conn.close();
     }
     
+    /**
+     * Test that no exception is thrown if the client info of a connection managed in a connection pool is reset
+     * to its initial values.
+     * 
+     * This is needed when using h2 in websphere liberty.
+     */
+    private void testSetInternalPropertyToInitialValue() throws SQLException {
+      // Use MySQL-mode since this allows all property names
+      // (apart from h2 internal names).
+      Connection conn = getConnection("clientInfoMySQL;MODE=MySQL");
+      
+      String numServersPropertyName = "numServers";
+      
+			String numServers = conn.getClientInfo(numServersPropertyName);
+      
+      conn.setClientInfo(numServersPropertyName, numServers);
+      
+      assertEquals(conn.getClientInfo(numServersPropertyName), numServers);
+
+      conn.close();
+  }
+
+
     private void testSetUnsupportedClientInfoProperties() throws SQLException {
         Connection conn = getConnection("clientInfo");