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How to map calculated properties with JPA and Hibernate
My Java bean has a childCount property. This property is not mapped to a database column . Instead, it should be calculated by the database with a COUNT() function operating on the join of my Java bean and its children. It would be even better if this property could be calculated on demand / "laz...
How to do a SOAP Web Service call from Java class?
...nd your problem boils down to how to call a SOAP (JAX-WS) web service from Java and get its returning object. In that case, you have two possible approaches:
Generate the Java classes through wsimport and use them; or
Create a SOAP client that:
Serializes the service's parameters to XML;
Calls t...
解决：Failed to load JavaHL Library（windows及mac） - 更多技术 - 清泛...
解决：Failed to load JavaHL Library（windows及mac）Failed to load JavaHL Library.These are the errors that were encountered:no libsvnjavahl-1 in java.library.pathno sv...Failed to load JavaHL Library.
These are the errors that were encountered:
no libsvnjavahl-1 in java.library.path
no svnj...
Why do Java programmers like to name a variable “clazz”? [closed]
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clazz has been used in Java in place of the reserved word "class" since JDK 1.0. "class" is what you want, but abbreviating or inserting junk ("a", "the", "_", etc) reduces clarity. clazz just says class. "International" English speakers (those rea...
Why is there no multiple inheritance in Java, but implementing multiple interfaces is allowed?
Java doesn't allow multiple inheritance, but it allows implementing multiple interfaces. Why?
18 Answers
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Why is the String class declared final in Java?
From when I learned that the class java.lang.String is declared as final in Java, I was wondering why that is. I didn't find any answer back then, but this post: How to create a replica of String class in Java? reminded me of my query.
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What does “The APR based Apache Tomcat Native library was not found” mean?
...allows optimal performance in production environments was not found on the java.library.path"
The library referred to is bundled into an OS specific dll (tcnative-1.dll) loaded via JNI. It allows tomcat to use OS functionalities not provided in the Java Runtime (such as sendfile, epoll, OpenSSL, sy...
Java RegEx meta character (.) and ordinary dot?
In Java RegEx, how to find out the difference between . (dot) the meta character and the normal dot as we using in any sentence. How to handle this kind of situation for other meta characters too like ( * , + , \d ,...)
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What are Runtime.getRuntime().totalMemory() and freeMemory()?
...ding to the API
totalMemory()
Returns the total amount of memory in the Java virtual machine. The value returned by this method may vary over time, depending on the host environment.
Note that the amount of memory required to hold an object of any given type may be implementation-dependent.
maxM...
Java Look and Feel (L&F) [closed]
I am developing a desktop application with Java Swing for my personal use.I am in need of some beautiful Look and Feel for my application. How can I do it using Java or a 3rd party API?
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