use eclipse's null analysis to fix some potential null accesses

h2/src/test/org/h2/test/jdbcx/TestXA.java

@@ -323,10 +323,14 @@ public class TestXA extends TestBase {
             JdbcUtils.closeSilently(stat2);
             JdbcUtils.closeSilently(conn1);
             JdbcUtils.closeSilently(conn2);
+            if (xaConn1 != null) {
                 xaConn1.close();
+            }
+            if (xaConn2 != null) {
                 xaConn2.close();
             }
         }
+    }
 
     private XADataSource createXADatasource(boolean useOneDatabase, String url) {
         JdbcDataSource ds = new JdbcDataSource();

h2/src/test/org/h2/test/poweroff/TestRecover.java

@@ -307,11 +307,9 @@ public class TestRecover {
     }
 
     private static boolean testConsistency() {
-        FileOutputStream out = null;
         PrintWriter p = null;
         try {
-            out = new FileOutputStream(TEST_DIRECTORY + "/result.txt");
-            p = new PrintWriter(out);
+            p = new PrintWriter(new FileOutputStream(TEST_DIRECTORY + "/result.txt"));
             p.println("Results");
             p.flush();
         } catch (Throwable t) {
@@ -338,9 +336,11 @@ public class TestRecover {
                     t2.printStackTrace(p);
                 }
             }
+            if (p != null) {
                 p.flush();
                 p.close();
-            IOUtils.closeSilently(out);
+                IOUtils.closeSilently(p);
+            }
         }
     }
 

h2/src/test/org/h2/test/unit/TestPageStore.java

@@ -564,16 +564,20 @@ public class TestPageStore extends TestBase implements DatabaseEventListener {
             conn.close();
             FileUtils.delete(getBaseDir() + "/pageStore.sql");
         } catch (Exception e) {
+            if (stat != null) {
                 try {
                     stat.execute("shutdown immediately");
                 } catch (SQLException e2) {
                     // ignore
                 }
+            }
+            if (conn != null) {
                 try {
                     conn.close();
                 } catch (SQLException e2) {
                     // ignore
                 }
+            }
             throw new RuntimeException("count: " + count, e);
         }
     }