Database query that works directly with the DBMS, but not in Java

Question

I am trying to do something before Ingest processes it before the KIT DataManager ( GitHub code , it works on tomcat7) with an "intermediate recording processor" ...

adding a custom middleware

package edu.kit.dama.mdm.content.mets;

...

public class TryQuota extends AbstractStagingProcessor {

...

@Override
public final void performPreTransferProcessing(TransferTaskContainer pContainer) throws StagingProcessorException {

...

trying to get user data

... it works

        UserData userResult = null;
        try {
            userResult = mdm.findSingleResult(
                        "Select u FROM UserData u WHERE u.email=?1",
                        new Object[]{"[e-mail]"},

emailadmin user standard with userid1

                        UserData.class
                    );
        } catch (UnauthorizedAccessAttemptException e2) {
            System.out.println("exception on extracting userid");
                    e2.printStackTrace();
        }
        try {
            System.out.println("KIT DM ID: " + userResult.getUserId());
        }catch(Exception e4) {
            System.out.println("exception on output for userid");
            e4.printStackTrace();
        }

trying to get a quota from UserQuota p>

and on the other hand, the corresponding implementation does not do the work here (what I want to get)

        Number UserQuota = null;
        try {
            UserQuota = mdm.findSingleResult(
 //SQL would be: "SELECT quota FROM userquota WHERE uid=?;"
 //JPQL is …
                    "Select q.quota FROM UserQuota q WHERE q.uid=?1",
                    new Object[]{1},
                    Number.class
            );
        } catch (UnauthorizedAccessAttemptException e2) {
            System.out.println("exception on userquota");
            e2.printStackTrace();
        }
        System.out.println("quota is: " + UserQuota );

UserQuota still null here

DB - PostgreSQL, table:

CREATE SEQUENCE userquota_seq       
    START WITH 1
    INCREMENT BY 1
    NO MAXVALUE
    NO MINVALUE;

CREATE TABLE userquota
( 
   id INTEGER NOT NULL DEFAULT nextval('userquota_seq'),
   uid INTEGER NOT NULL DEFAULT 0,
   quota DECIMAL NOT NULL DEFAULT 0,        
   CONSTRAINT uid_key UNIQUE (uid), 
   CONSTRAINT fk_uid FOREIGN KEY (uid) REFERENCES users(id)     
);

This quota I want to get from db in the processor

INSERT INTO userquota (id, uid,quota) VALUES ( 0, 1, 1048576 );

So basically I want to get an entry for the user (here 1) from db: 1048576like Long.

, .

Answer 1

, SQL:

SELECT u FROM UserData u WHERE u.email=?1

, , :

SELECT u.* FROM UserData u WHERE u.email='[e-mail]'

Answer 2

, UserQuota 1, JPQL . , UserData, , , UserQuota. , db .

, , , tomcat7 persistence.xml, UserData.