Work

Recounting a strange little compatibility issue I had between ZSI 2.0 and CXF 2.0.x. I was using CXF as the server, running from Maven using Jetty, and ZSI as the client. The parameters from the ZSI were arriving at the service implementation as null. With the web services logging turned on I could see that the SOAP packet was arriving OK, and looked good. A little bit of digging round the web turned up this message. The issue was that ZSI wasn’t explicitly namespacing the elements, and so CXF was not seeing them. The solution was to add elementFormDefault=“qualified” to my WSDL definition, and rebuild the ZSI stubs. ...

At work we have one VM which hosts all our project management software like Git, SVN, Trac and Bugzilla. However, recently it has been taking a hammering and essentially crashing. The issue was it was running out of RAM, and swapping like crazy. A little investigation into the situation uncovered that there were some Trac 0.10 CGI processes which were using >500MB of memory. Using the ps ewww -p <pid> command to look at the environment variables of the processes we determined that each of them was serving the same kind of request, SVN changesets. And essentially all of them were being hit by spiders. ...

Setting up a new MyProxy (v3.9 12 Jun 2007 PAM OCSP) from VDT 1.8.1 I ran across an annoying segfault issue when running the server to run as a CA, in debug mode. # myproxy-server -dmax_proxy_lifetime: 43200 seconds PAM enabled, policy requiredCA enabledmax certificate lifetime: 43200 seconds using storage directory /var/myproxy Starting myproxy-server on localhost:7512... Connection from 127.0.0.1 using trusted certificates directory /opt/vdt/globus/TRUSTED_CA Authenticated client <anonymous> applying trusted_retrievers policy trusted retrievers policy matched applying authorized_retrievers policy applying authorized_renewers policy Program received signal SIGSEGV, Segmentation fault. Note, the client can connect and only fails once the client responds with their credentials. Using GDB I got the stack trace of the issue: ...

The problem I’ve been address in my most recent work block has been to develop an interface to a relational data store which can be used either as a local DB, or via webservices. The concept is quite straight forward, we want CRUD operations on a set of data objects. The schema is fairly straight forward too, with a core hierarchy of elements with a few enumerated lists. As well as a few cuts across the hierarchy. ...