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46

General Settings and Logging

logging levels are: "fatal" "error" "warning" "info" "trace" "debug"
27

Entity Management Settings

: <entities> <enhancement agent="true" reflection="warning" /> <cache ref="weak" level2="0mb ... > The <enhancement> element <enhancement agent="true" reflection="warning" /> The <enhancement> element ... must be enhanced - otherwise an exception is thrown. "warning" - a warning is logged for every non
19

InternalError on multiple AND and JOIN Query

-resources}] [WARNING] Using platform encoding (UTF-8 actually) to copy filtered resources, i.e. build ... -compile}] [WARNING] File encoding has not been set, using platform encoding UTF-8, i.e. build is platform ... /target/classes [INFO] [resources:testResources {execution: default-testResources}] [WARNING] Using
17

Running JPA Queries

>) will cause a compilation warning. If, however, the new TypedQuery interface is used - casting is unnecessary and the warning is avoided. The query result collection functions as any other ordinary Java
12

Posting Sample Code

please ignore its strict JPA warnings (There is no ID defined for this entity hierarchy, The class
4

objectdb-2.6.9_06: Extended Persistence Context fails: 'Attempt to begin a new transaction when a transaction is active'

{ ... Warning: A system exception occurred during an invocation on EJB ExtProjectBuilder, method ... .ExtProjectBuilder.buildProject(java.lang.String) Warning: javax.ejb.EJBException: com.objectdb.o ... = "buildProject"; if (em == null) { log_warn($i, "BEFORE: Extended entity
3

javax.persistence.criteria.From

not cause type conversion: the runtime type is not changed. Warning: may result in a runtime failure
3

javax.persistence.criteria.Join

expression object. This method does not cause type conversion: the runtime type is not changed. Warning
3

Step 2: Define a JPA Entity Class

is an ordinary Java class. The warning that NetBeans displays on the Guest class indicates that a persistence ... . But nevertheless, this class is a valid ObjectDB entity class, despite the warning. The next step is adding a Main
3

Step 2: Define a JPA Entity Class

class is an ordinary Java class. The warning that NetBeans displays on the Guest class indicates ... . But nevertheless, this class is a valid ObjectDB entity class, despite the warning. The next step

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.

Need Help?

  1. Search ObjectDB website
  2. Read the FAQ
  3. Follow the Tutorials
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  5. Search or file an issue
  6. Contact support