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Batchupdate is freezed only for large number of rows

From my spring java code, i am trying to insert 13,500 rows into a table in oracle database through below step.
NamedParameterJdbsTemplate.batchupdate(insert quert, listname. Toarray(new map(list.size());
But the process gets freeze at this step, it does not throw any error.
Observed this only when inserting more number of records into table.
Able to insert successfully with above step when I try to insert 12000 or less rows.
But when I try to insert 13500 rows, the process gets freeze and do not throw any error either.
Able to insert even 40k rows at once into the same table from database.
Db table does not causing any issue, but facing this issue only from batchupdate form java that too only for rows above 12000.
Could you please help me how to figure what causing this issue?

Is there a way to reset all the ID's of records in a h2 Database?

I have an application that uses a h2 Database to store records of data. Each record is assigned a unique ID that I have used the auto-increment feature in h2 to do so. I want the lowest number to always be 1, or at least fill up the numbers that are not filled when a record has been deleted. What I mean is if there are 5 records numbered 1-5 and I delete the third record, I want the next record added to be numbered 3 instead of 6. How should I go about achieving this?
So far, I've tried
ALTER TABLE <table_name> ALTER COLUMN <id_column> RESTART WITH 1
Which doesn't have the intended effect that I wanted.
Edit: I'm an idiot, I wrote the SQL Query without actually executing it. The does indeed restart from 1, but throws an exception whenever the increment value is in a value that already exists. How should I fix this?

JDBC claims table does not exist

I am using the embedded h2 database inside of the play framework. I am trying to insert some test data into it, then retrieve that data.
as you can see, the right side shows me that there is indeed a suscribers table, but when being run, I get this:
What am I doing wrong?

Try with dbName.tblName, for example:
insert into dbName.tblName ...
and also:
You are inserting 2 columns out of 3 columns per table. I think you have to mention column names as well.

My ResultSet is fetching only 7500 rows, but I want to fetch all my rows which are available in database table

My ResultSet is fetching only 7500 rows, but I want to fetch all my rows which are available in the database table.
For this I used resultset.setFetchSise(100000), even though it is fetching only 7500 rows.
I would happy if any body help me in this regard.

The Javadoc states -
Gives the JDBC driver a hint as to the number of rows that should be fetched from the database when more rows are needed for ResultSet objects genrated by this Statement. If the value specified is zero, then the hint is ignored. The default value is zero.
So this is only giving a hint that you want more returned.
As already stated you would need to post more information to advise on your problem -
Sample code - are you returning CLOBs, ...
Driver used

Retrieve the value of the newly inserted row in sql server

I am developing android application. In my application i have used sql server2008 R2. I am inserting the row in the sql server on some click event. Now i want to fetch the first column's value from the newly inserted row. The first column's value of that schema is auto generated.I am inserting the value from the second column in my insert query. I am using jdbc. In .net to achieve this functionality method ExecuteScalar() is der. But what in java. I have done lots of googling but haven't found any thing. Help me if you the solution.

As per request to move comment to an answer.
You may find this question helpful.
How to get the insert ID in JDBC?