Fixed hsqldb tests

.mvn/jvm.config

@@ -1 +0,0 @@
--Xmx8G -Xms1024m

dao/src/test/java/org/thingsboard/server/dao/CustomSqlUnit.java

@@ -58,6 +58,8 @@ public class CustomSqlUnit extends ExternalResource {
 
     @Override
     public void before() {
+        cleanUpDb();
+
         Connection conn = null;
         try {
             conn = DriverManager.getConnection(dbUrl, dbUserName, dbPassword);
@@ -81,6 +83,10 @@ public class CustomSqlUnit extends ExternalResource {
 
     @Override
     public void after() {
+        cleanUpDb();
+    }
+
+    private void cleanUpDb() {
         Connection conn = null;
         try {
             conn = DriverManager.getConnection(dbUrl, dbUserName, dbPassword);

dao/src/test/resources/sql-test.properties

@@ -1,4 +1,4 @@
-database.type=sql
+ database.type=sql
 
 spring.jpa.show-sql=false
 spring.jpa.hibernate.ddl-auto=validate
@@ -6,5 +6,5 @@ spring.jpa.database-platform=org.hibernate.dialect.HSQLDialect
 
 spring.datasource.username=sa
 spring.datasource.password=
-spring.datasource.url=jdbc:hsqldb:mem:testDb;sql.enforce_size=false
+spring.datasource.url=jdbc:hsqldb:file:/tmp/testDb;sql.enforce_size=false
 spring.datasource.driverClassName=org.hsqldb.jdbc.JDBCDriver