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Alternatives to java.lang.reflect.Proxy for creating proxies of abstract classes (rather than interf
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It can be done using Javassist (see ProxyFactory) or CGLIB.
Adam's example using Javassist:
I (Adam Paynter) wrote this code using Javassist:
ProxyFactory factory = new ProxyFactory();
factory.setSuperclass(Dog.class);
factory.setFilter(
n...
What is this: [Ljava.lang.Object;?
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[Ljava.lang.Object; is the name for Object[].class, the java.lang.Class representing the class of array of Object.
The naming scheme is documented in Class.getName():
If this class object represents a reference type that i...
Retrieving the inherited attribute names/values using Java Reflection
I've a Java object 'ChildObj' which is extended from 'ParentObj'. Now, if it is possible to retrieve all the attribute names and values of ChildObj, including the inherited attributes too, using Java reflection mechanism?
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How to get Android crash logs?
...g due to uncaught exception
09-04 21:35:15.397: ERROR/AndroidRuntime(778): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.dazlious.android.helloworld/com.dazlious.android.helloworld.main}: java.lang.ArrayIndexOutOfBoundsException
09-04 21:35:15.397: ERROR/AndroidRuntime(778):...
How can a Java program get its own process ID?
How do I get the id of my Java process?
22 Answers
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Checking if a string is empty or null in Java [duplicate]
...tring which consists of spaces or special characters eg " " empty too. See java.lang.Character.isWhitespace API
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Error java.lang.OutOfMemoryError: GC overhead limit exceeded
... objects in an already very memory-constrained environment.
Check out the Java GC tuning guide, which is available for various Java versions and contains sections about this specific problem:
Java 11 tuning guide has dedicated sections on excessive GC for different garbage collectors:
for the P...
How do I check that a Java String is not all whitespaces?
I want to check that Java String or character array is not just made up of whitespaces, using Java?
15 Answers
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Check whether a string is not null and not empty
...isEmpty())
Be sure to use the parts of && in this order, because java will not proceed to evaluate the second part if the first part of && fails, thus ensuring you will not get a null pointer exception from str.isEmpty() if str is null.
Beware, it's only available since Java SE 1....
java.lang.OutOfMemoryError: Java heap space
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If you want to increase your heap space, you can use java -Xms<initial heap size> -Xmx<maximum heap size> on the command line. By default, the values are based on the JRE version and system configuration. You can find out more about the VM options on the Java websit...