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Finding the current persistence unit for the current EntityManagerFactory
(2 answers)
Closed 8 years ago.
How do you get the name of a persistence-unit in Java? I have a persistence.xml with many units, so I want to control which unit is used to create my EntityManager.
There's method like getPersistenceName or smth? I have searched for a while but did not find anything useful.
Please check this thread:
Finding the current persistence unit for the current EntityManagerFactory
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How to intercept object creation in Java lower than user class level
(2 answers)
Closed 6 years ago.
Many times I've seen some people tracked how the VM creates objects and how it performs optimization (eg: String concatenation). Unfortunately I can't find the correct command. Does anyone know?
The best tool for this kind f investigation is to use a profiler. I would start with Flight Recorder to record object allocations and CPU consumption and where this is happening.
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Disable the Ctrl-Alt-Delete event through Java program
(4 answers)
Closed 7 years ago.
Is there any way to block the control key in java. I have looked and looked but I have not found any way to do it thanks in advance
There is no way to block CTRL+ALT+DELETE. In any way, shape or form. It is an absolute guarantee against hacking.
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Conditionally ignoring tests in JUnit 4
(5 answers)
Closed 8 years ago.
It can be happened, that the the unit test cannot test properly due too system condition.
eg: another job is running, what locks a table what is used by a service what should be tested.
in this case the output of the test should not be SUCCESS nor FAIL...
it should be just like IGNORED
is there a way to set the unit test 'ignored' in the test itself?
It looks like you want Assume from JUnit4. Look at this documentation http://junit.sourceforge.net/javadoc/org/junit/Assume.html
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How to choose the right bean scope?
(2 answers)
Closed 8 years ago.
<managed-bean>
<managed-bean-name>tagTypeEnumAddNewFO</managed-bean-name>
<managed-bean-class>packagename.classname</managed-bean-class>
<managed-bean-scope>view</managed-bean-scope>
</managed-bean>
Here what is the use of ?
The scope in JSF means lifetime of the bean.
There are several scopes like Session, View etc.
To understand more about it visit Blog by JSF Expert BalusC here
It tells how long the object is supposed to live in the application before it is instantiated again. In this example, it will only be "alive" for the remainder of the view you are on. So typically one request on the same view.
Other examples are session, which will remain in memory until your session expires, or explicitly is removed.
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How to clear all Hibernate cache (ehcache) using Spring?
(7 answers)
Closed 9 years ago.
Recently uses the secondary level cache in my project there
is some issue with it , i wanted to know how can i clear it secondary cache
If you want to clear cache in code you can use:
sf.getCache().evictEntityRegions()
sf.getCache().evictCollectionRegions()
sf.getCache().evictDefaultQueryRegion()
sf.getCache().evictQueryRegions()
where sf means session factory