Tagged Questions
1
vote
1answer
18 views
Error when trying to 'search similar images' using jsp
I am building a web application for feature extraction and comparing the feature of images, using jsp, java and postgresql.
My feature extraction is extracting some features from images, so that then ...
1
vote
1answer
32 views
COPY FROM and C3PO connection pool in Postgres
I have the follow code in my JAVA program that allows me to copy data from a file into my Postgres database:
Connection con = DriverManager.getConnection("jdbc:postgresql://localhost:####/myDb",
...
0
votes
1answer
23 views
Using PL/Java with JPA or other persistence library
I'm wondering if it's possible to use JPA or other persistence library with PL/Java together?
I mean using JPA persistence for manipulationg database over the special JDBC connection provided by ...
0
votes
0answers
71 views
Can't save the features of an image in the PostgreSQL database
I am building an application that extracts the feature of an image and saves it to the database (using JSP, Java & PostgreSQL ).
I have based it on Caliph & Emir website. ( ...
1
vote
0answers
116 views
Hibernate 3.6.10 doesn't cascade delete through OneToMany JoinTable
I've been messing with this and googling it for about 4 days and I'm getting crazy about how Hibernate annotations work with JPA annotations. I have two very simple entities:
Student
package ...
0
votes
2answers
33 views
postgresql hibernate Exception on insert
Hi I'm running a java project using hibernate with postgresql 9.2, when i try to insert it will display:
Exception in thread "main" org.hibernate.exception.SQLGrammarException: Could not execute JDBC ...
0
votes
2answers
38 views
Hibernate startup very slow
For some reason, the startup of my hibernate application is unbarrably slow. (up to 2 min)
I have been thinking that the c3p0 configuration is plain wrong (related question) but studying the logs ...
1
vote
2answers
49 views
Insert with DEFAULT id doesn't work in postgress
I tried running this statement in Postgress:
insert into field (id, name) values (DEFAULT, 'Me')
and I got this error:
ERROR: null value in column "id" violates not-null constraint
I ended up ...
1
vote
3answers
50 views
PostgreSQL (weird): NoClassDefFoundError: com/mysql/jdbc/StringUtils
I am getting well-known NoClassDefFoundError: com/mysql/jdbc/StringUtils, but my case is little different: I am not using MySQL at all.
I'm working with PostgreSQL 9.1 database using JDK 1.6.
On my ...
1
vote
1answer
34 views
Why am I unable to use prepared statements to update a database?
Consider the following code:
String updatestmt = "UPDATE marketplaces.amazon_merchant_fulfilled_orders SET order_status = ? WHERE amazon_order_id=?;";
Connection conn = connectToDatabase();
...
0
votes
1answer
26 views
Using Spring 3 to generate sql that uses cursors in Postgres
I have java webapp that I've upgraded from spring 2.5.x to spring 3.x.
Everything post-upgrade works except that database load has gone up and queries are taking longer. The stack is Hibernate ...
0
votes
0answers
15 views
Hibernate 3.2 IdentifierGeneratorFactory can't create big_decimal type
I am using Hibernate 3.2, PostgreSQL 9. My database's id's are big_decimal type. I used reverse engineering and got hbm.xml files.
But Hibernate 3.2 aren't supporting big_decimal. I tried extend ...
0
votes
1answer
28 views
Porting SQL/plPGsql tests to Java/JDBC: test an exception
I'm porting database schema tests from sql/plpgsql to Java/JDBC. But here is a test case I can't figure out how to test. As I can guess, this test tries to insert some row to a table, and expects ...
0
votes
2answers
45 views
Memory leak in java liferay project
When i try to re-deploy my project, sometimes it run out of memory and throw perGemSpace error (just re-deploy 2-3 times)
I know my project have some memory leak trouble but can't figure out, someone ...
1
vote
2answers
53 views
How can I execute non-query Stored Procedure in JDBC
I have a stored procedure in a postgres database. I'm using the postgres JDBC driver to execute a stored procedure, and I do not care about the return type, and can't execute the query. It's ...
