close these connections quietly

we're not interesting in exceptions in closing in these tests

h2/src/main/org/h2/util/IOUtils.java

@@ -34,9 +34,9 @@ public class IOUtils {
     }
 
     /**
-     * Close an output stream without throwing an exception.
+     * Close a Closeable without throwing an exception.
      *
-     * @param out the output stream or null
+     * @param out the Closeablem or null
      */
     public static void closeSilently(Closeable out) {
         if (out != null) {
@@ -49,6 +49,22 @@ public class IOUtils {
         }
     }
 
+    /**
+     * Close an AutoCloseable without throwing an exception.
+     *
+     * @param out the AutoCloseable or null
+     */
+    public static void closeSilently(AutoCloseable out) {
+        if (out != null) {
+            try {
+                trace("closeSilently", null, out);
+                out.close();
+            } catch (Exception e) {
+                // ignore
+            }
+        }
+    }
+
     /**
      * Skip a number of bytes in an input stream.
      *

h2/src/test/org/h2/test/db/TestMultiThread.java

@@ -25,6 +25,7 @@ import org.h2.api.ErrorCode;
 import org.h2.jdbc.JdbcSQLException;
 import org.h2.test.TestAll;
 import org.h2.test.TestBase;
+import org.h2.util.IOUtils;
 import org.h2.util.SmallLRUCache;
 import org.h2.util.SynchronizedVerifier;
 import org.h2.util.Task;
@@ -374,7 +375,7 @@ public class TestMultiThread extends TestBase implements Runnable {
                 }
             }
         } finally {
-            conn.close();
+            IOUtils.closeSilently(conn);
             executor.shutdown();
             executor.awaitTermination(20, TimeUnit.SECONDS);
         }
@@ -426,7 +427,7 @@ public class TestMultiThread extends TestBase implements Runnable {
                 job.get(5, TimeUnit.MINUTES);
             }
         } finally {
-            conn.close();
+            IOUtils.closeSilently(conn);
             executor.shutdown();
             executor.awaitTermination(20, TimeUnit.SECONDS);
         }
@@ -483,7 +484,7 @@ public class TestMultiThread extends TestBase implements Runnable {
                 job.get(5, TimeUnit.MINUTES);
             }
         } finally {
-            conn.close();
+            IOUtils.closeSilently(conn);
             executor.shutdown();
             executor.awaitTermination(20, TimeUnit.SECONDS);
         }