This is often caused by a white space before the XML declaration, but it could be any text, like a dash or any character. I say often caused by white space because people assume white space is always ignorable, but that’s not the case here. Another thing that often happens is a UTF-8 BOM (byte order mark), which is allowed … Read more
Rather than relying on SOCKS proxying, use To establish a direct connection across the ssh tunnel.
The following is part of the List interface (which ArrayList implements): E is the element type. If the list is empty, get throws an IndexOutOfBoundsException. You can find the whole API documentation here.
You should include cascade=”all” (if using xml) or cascade=CascadeType.ALL (if using annotations) on your collection mapping. This happens because you have a collection in your entity, and that collection has one or more items which are not present in the database. By specifying the above options you tell hibernate to save them to the database when saving their parent.
The Wikipedia page on it is a good place to start. To sum up: float is represented in 32 bits, with 1 sign bit, 8 bits of exponent, and 23 bits of the significand (or what follows from a scientific-notation number: 2.33728*1012; 33728 is the significand). double is represented in 64 bits, with 1 sign bit, 11 bits of … Read more
It’s the directory where java was run from, where you started the JVM. Does not have to be within the user’s home directory. It can be anywhere where the user has permission to run java. So if you cd into /somedir, then run your program, user.dir will be /somedir. A different property, user.home, refers to the user directory. As in /Users/myuser or /home/myuser or C:\Users\myuser. See here for a list of … Read more
You need a 64-bit trio: 64-bit OS 64-bit Java 64-bit Eclipse
Android actually can decode and display animated GIFs, using android.graphics.Movie class. This is not too much documented, but is in SDK Reference. Moreover, it is used in Samples in ApiDemos in BitmapDecode example with some animated flag.
In general it’s best not to rely on finalize() to do any cleaning up etc. According to the Javadoc (which it would be worth reading), it is: Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. As Joachim pointed out, this may never happen in the life … Read more
You probably should module your program – as I can understand it, you are reading the maze from file and trying to solve it at the same time. A better approach will be to split the program into 2 distinct parts: read the input file and create a matrix with all the data solve the maze from … Read more