I’m currently configuring hadoop on a server running CentOs. When I run start-dfs.sh or stop-dfs.sh, I get the following error: WARN util.NativeCodeLoader: Unable to load native-hadoop library for …
Are server 500 errors a security issue?
I’ve found that it’s possible to cause 500 errors on a server using curl and a faked GWT-Permutation with a POST payload. The payload is generating a java.lang.Exception on an Apache server. Does this open up a security issue? Should I report it to Google’s GWT support? To clarify the question: Would a significant number of server errors be a
Selecting Nth-of-type in selenium
I’m trying to use By.cssSelector to grab the nth dom element with class c3 with a structure like this:
<div class="…
Jaas Basic Authentication tomcat 7
I keep on getting the same error, I have already changed the tomcat7w file that specifies the jaas config file location I have already added this tom my tomcat7w.exe file. another is that I also have this realm so what am I missing? please help me, I am using netbeans, tomcat 7.0.47. I have resolved to using glassfish! Answer According
java.io.FileNotFoundException: the system cannot find the file specified
I have a file named “word.txt”. It is in the same directory as my java file. But when I try to access it in the following code this file not found error occurs: Exception in thread “main” java.io….
Java read file and store text in an array
I know how to read a file with Java using Scanner and File IOException, but the only thing I don’t know is how to store the text in the files as an array. Here is a snippet of my code: Here is what my KeyWestTemp.txt file contains: Answer Stored as strings: For floats:
Why does my ArrayList contain N copies of the last item added to the list?
I’m adding three different objects to an ArrayList, but the list contains three copies of the last object I added. For example: Expected: Actual: What mistake have I made? Note: this is designed to be a canonical Q&A for the numerous similar issues that arise on this site. Answer This problem has two typical causes: Static fields used by the
How to keep a variable value even after doing run as-> Java Application?
I know that when we use static variables the value remains the same for all the instances of a class. But when I do run as -> Java Application in a class, even the static variable is reinicialized …
How to retrieve my public and private key from the keystore we created
My task is the following: Retrieve my public and private key from the keystore I created. Use these keys to encrypt a paragraph using my RSA 2048-bit public key. Digitally sign the result using the DSA-SHA-1 signature algorithm. Save the digital signature output on a file called output.dat. The program below is throwing error : “java.security.InvalidKeyException: No installed provider supports
Unidentified developer for Java Web Start application on OS X
On Mac OS X 10.9 signed Java Web Start applications are blocked by default with the message: “application.jnlp” can’t be opened because it is from an unidentified developer. I know it’s possible to …