Yesterday punchagan introduced me with PEBKAC - Problem Exist Between Keyboard And Chair, it was a Things I learned(TIL). I had experienced this before many times, only I didn't know that there was such a term.

Starting in April, at TaxSpanner I was given task to integrate ITD Webservices APIs for income tax return filing and other features with our existing stack. The procedure included quite a few alien things to me. Sample codes provided by ITD were in Java, they were using SPRING framework. Our requests had to be routed via specific proxy approved from ITD and furthermore we physically needed an USB DSC key registered with ITD to encrypt the communication.

As I was trying to get first successful run of API working from my system, I was stuck with accessing DSC key from my java code. It needed drivers available here and java security(/etc/java-7-openjdk/security/java.security)config file to be edited properly to use correct drivers. After doing these things first thing I tried was to list certificates on the USB token using keytools. And on first run, it worked fine. I was ecstatic, one fewer unknown from the pile of unknowns, right. Wrong, as soon as I tried to run java programs using DSC it threw up lines and lines of error which went something like:

org.springframework.beans.factory.parsing.BeanDefinitionParsingException: Configuration problem: Unable to locate Spring NamespaceHandler for XML schema namespace [http://cxf.apache.org/core]
Offending resource: class path resource [ClientConfig.xml]

	at org.springframework.beans.factory.parsing.FailFastProblemReporter.error(FailFastProblemReporter.java:68)
	at org.springframework.beans.factory.parsing.ReaderContext.error(ReaderContext.java:85)
	at org.springframework.beans.factory.parsing.ReaderContext.error(ReaderContext.java:80)
	at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.error(BeanDefinitionParserDelegate.java:318)
	at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1435)
	at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1428)
	... 
	at itd_webs.core.main(Unknown Source)
2016-05-11 12:03:48,114 [main] WARN  org.apache.cxf.bus.spring.SpringBusFactory -  Failed to create application context.
org.springframework.beans.factory.parsing.BeanDefinitionParsingException: Configuration problem: Unable to locate Spring NamespaceHandler for XML schema namespace [http://cxf.apache.org/core]
Offending resource: class path resource [ClientConfig.xml]

Getting configs in place so that SPRING framework can load proper credentials from DSC was one another task where inputs from Nandeep proved very crucial. Thankfully we had one more system where the Java code and setup with the DSC worked. So it was clear that the particular error related to DSC recognition was just on my system. After lot of head scratching, comparing two systems to identify if something is amiss, trying strace, nothing helped. After scrolling through lot of java related stackoverflow conversations I was playing around with keytools and jdb. As I tried JDB, I noticed DSC blinking and then I thought that the maybe default java was using different configs, I checked my /usr/lib/jvm/ and indeed there were 4 different version of java. I checked java -version and it pointed to java version "1.8.0₆₅" so instead I tried to compile and run command using /usr/lib/jvm/java-1.7.0-openjdk-amd64/bin/java and USB blinked happily ever after. While we kept developing and making system stable on computer where things were working, to get it working on my system it almost took two weeks to narrow down to exact issue. And now I have a name for all the time spent, PEBKAC. Thank you punchagan.