16 | Exceeding max connections and crashing down and database lost connection with the JBOSS AS, several restarts got it up and running finally ... to implement closing of connection after every commit we make by the user? Q2. Our JBOSS AS frequently ... hype size to 6GB and since that we haven’t have any crashes of JBOSS. Important to note is that JBOSS |
3 | ObjectDB-2.6.9: Failed to commit transaction: Failed to set numeric value of field property Element.id using reflection console app for NetBeans8.1 provided, as explained below). To reproduce download the app and unpack ... as owner project.addOwnedElement(model); Element example = new Element ... .jboss.weld.ejb.AbstractEJBRequestScopeActivationInterceptor.aroundInvoke |
3 | Database Connection using JPA instance obtained from the EntityManager. An EntityManager instance also functions as a factory ... of the createEntityManagerFactory method takes a map of persistence unit properties as a second parameter: Map<String ... the database file. Connection URL The createEntityManagerFactory method takes as an argument a name |
3 | JPA Criteria API Queries JPQL queries are defined as strings, similarly to SQL. JPA criteria queries, on the other hand ... .g. as named queries) may be preferred. For dynamic queries that are built at runtime - the criteria ... An equivalent query can be built using the JPA criteria API as follows: CriteriaBuilder cb = em |
3 | SSL Configuration") specifies if SSL is used. As shown above, SSL is disabled by default. It could be enabled when accessing remote ObjectDB databases over an insecure network such as the Internet. SSL Keystore and Truststore Files To use SSL you have to generate at least two files: A Keystore file that functions as |
3 | Date and Time in JPQL and Criteria QueriesDate and time expressions may appear in JPQL queries: as date and time literals - e.g. {d '2011-12-31'}, {t '23:59:59'}. as parameters - when date and time values are assigned as arguments. as path expressions - in navigation to persistent date and time fields. as results of predefined JPQL current |
3 | Collections in JPQL and Criteria QueriesCollections may appear in JPQL queries: as parameters - when collections are assigned as arguments. as path expressions - in navigation to persistent collection fields. IS [NOT] EMPTY The IS [NOT ... , which should be used for checking other collections, such as a collection that is passed to the query |
3 | Logical Operators in JPQL and Criteria API of logical operators, as shown in the following table: Set 1 - JPQL / SQL Set 2 - Java / JDO AND && OR ... /JDO && operator as a synonym of AND as part of its JDO support. Binary OR (||) Operator ... || operator as a synonym for OR as part of its JDO support. Unary NOT (!) Operator The following query |
3 | Index Definition; } When indexed fields are specified explicitly in the members attribute, as shown ... , the @Uniques annotation can wrap multiple @Unique annotations. As shown above, the members attribute ... to values that are stored as part of the entity. Therefore, indexes on multi part paths |
3 | Defining a JPA Entity Class (annotated) as having the ability to represent objects in the database. Conceptually this is similar to serializable classes, which are marked as having the ability to be serialized. The Point Entity Class The following Point class, which represents points in the plane, is marked as an entity class |
