avoid out of memory

h2/src/main/org/h2/util/Cache2Q.java

@@ -52,6 +52,8 @@ public class Cache2Q implements Cache {
         headMain.next = headMain.previous = headMain;
         headIn.next = headIn.previous = headIn;
         headOut.next = headOut.previous = headOut;
+        // first set to null - avoiding out of memory        
+        values = null;
         values = new CacheObject[len];
         sizeIn = sizeOut = sizeMain = 0;
         recordCount = 0;

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

@@ -39,6 +39,8 @@ public class CacheLRU implements Cache {
 
     public void clear() {
         head.next = head.previous = head;
+        // first set to null - avoiding out of memory
+        values = null;
         values = new CacheObject[len];
         recordCount = 0;
         sizeMemory = 0;

h2/src/test/org/h2/test/TestAll.java

@@ -281,6 +281,8 @@ java org.h2.test.TestAll timer
         
 /*
 
+truncate in-memory file system after each test
+
 split files (1 GB max size)
 
 Windows service Wrapper not starting because of incorrect classpath

h2/src/test/org/h2/test/TestBase.java

@@ -217,8 +217,10 @@ public abstract class TestBase {
             url += ";TRACE_LEVEL_SYSTEM_OUT=2";
         }
         if (config.traceLevelFile > 0 && admin) {
+            if (url.indexOf("TRACE_LEVEL_FILE=") < 0) {
                 url += ";TRACE_LEVEL_FILE=" + config.traceLevelFile;
             }
+        }
         if (config.throttle > 0) {
             url += ";THROTTLE=" + config.throttle;
         }

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

@@ -42,7 +42,7 @@ public class TestPowerOff extends TestBase {
         } else {
             dir = "memFS:";
         }
-        url = dir + "/" + dbName + ";file_lock=no";
+        url = dir + "/" + dbName + ";FILE_LOCK=NO;TRACE_LEVEL_FILE=0";
         testSummaryCrash();
         testCrash();
         testShutdown();