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10

Performance tuning, best practices

" /> <network inactivity-timeout="0" /> <url-history size="50" user="true" password="true" /> <log path ... ://localhost/test.odb;user=admin;password=admin" /> --> </server> <users> <user username="admin" password="admin"> <dir path="/" permissions="access,modify,create,delete" /> </user> <user username="$default
10

Find the error...JPA ENTITY HIBERNATE

; @SuppressWarnings("unused") @Entity @Table(name = "user") public class user implements Serializable ... ; } public void setEmail(String email) {   this.email = email; } public user ... ; @ManyToMany(mappedBy = "messages") private Set<user> user; public Set<user> getUser() { return user
10

Dirty checking

of objects. e.g: if a collection of User Entity objects changed in a transaction, I'd like to generate a Json object with a list of the Users which were Added, Deleted, and Changed. That is a simple ... user interface libraries, knockoutjs, Vuejs (actually based on a proposal I made in 2013 in
10

Level 2 cache not hit in @ManyToOne

Hi! I have 2 entities: User and Item, both @Cacheable. Item has @ManyToOne private User user. Level ... "user". "user" is loaded each time from the DB (tested by changing data in explorer and reading in my app). "user" should also be taken from L2 cache, shouldn't it? Otherwise...it's a huge performance
10

OutofMemory error with Object DB 2.0

Our IT team is still looking into it. madhuarish Bhanu Pathak Meanwhile other users used the FTP ... " threshold="64mb" /> <network inactivity-timeout="0" /> <url-history size="50" user="true ... ://localhost/test.odb;user=admin;password=admin" /> --> </server> <users> <user username="admin
10

Entity Type is not found (error 301) in Query

] select u from ==> User <== u where u.email = :email javax.persistence.PersistenceException Type User is not found (error 301) (position 14) at com.objectdb.jpa.JpaQuery.getResultList(JpaQuery.java:695) at at.sciencesoft.db.jpa.DAOjpa.query(DAOjpa.java:326) at at.sciencesoft.user.User
10

Optimistic Locking

an optimistic lock. I have two users logged on to our system. They both read and display the same data. Then I change the data with user 1 and submit, and then I change it with user 2 and submit. User 2 does not get an optimistic lock exception, so the database has user 2’s change. Do you have a simple test
10

Connection is closed Caused by: java.io.EOFException

" /> <data path="$objectdb/db-files" /> <!-- <replication url="objectdb://localhost/test.odb;user=admin;password=admin" /> --> </server> <users> <user username="admin" password="admin" ip="127.0.0.1" admin="true"> <dir path="/" permissions="access,modify,create,delete" /> </user
10

Replication Issue

.createEntityManagerFactory("objectdb://localhost:6001/KAKI.odb;user=admin;password=admin ... " user="true" password="true" />                 <log path="$objectdb/log/" max="8mb" stdout="false ... url="objectdb://12.345.678.910:6001/KAKI.odb;user=admin;password=admin" />         </server
2

database corrupt

is still unclear. There are no similar reports from other users and the stack traces are not very useful ... " /> <url-history size="50" user="true" password="true" /> <log path="$objectdb/log/" max="8mb" stdout ... " /> <embedded-server enabled="true" /> <replication url="objectdb://localhost/test.odb;user=admin

Getting Started

ObjectDB is very easy to use. Follow the Getting Started Tutorial and the Quick Tour manual chapter and in minutes you may be able to write and run first Java programs against ObjectDB.

Prior knowledge or experience in database programming (SQL, JDBC, ORM, JPA, etc.) is not required, but some background in using the Java language is essential.

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