Java development blog (tips, notes, …)
"First, solve the problem. Then, write the code." (John Johnson)

    Link: Xsd Reducer

    2017-08-11 18:00:00 +0000

    Simplify and reduce the size of the Xsd by deleting the unused declarations from it :

    Just does what it says. Good little tool.

    java is cool

    2017-02-02 18:00:00 +0000 :” There are many resources on news sites and blogs that carry valuable insights for your projects. Some are already well known, some a bit less and together they will keep you on the right track. Here are our favorites:”

    Commit empty folder structure (with git)

    2015-09-05 17:50:00 +0000

    In Git, you can’t commit empty folders, because Git does not actually save folders, only files. You’ll have to create some placeholder file inside those directories, if you actually want them to be “empty”.

    You could create a empty .gitignore file inside each empty folder. I find this confusing, since the goal is to keep the empty directories, not ignore them or some files inside of them.

    With the following script you can create a file named “.gitkeep” inside every empty folder. The filename has no meaning for git, but it makes it purpose clear.

    find . -type d -empty -not -path "./.git/*" -exec touch {}/.gitkeep \;

    AH00992: ajp_read_header: ajp_ilink_receive failed

    2015-06-02 13:31:00 +0000

    Recently I did not receive a response, after calling a webapp. There was no entry/error in the Application log. It was wired.

    Setup: Caller → Apache → Tomcat with Webapp

    After inspecting the apache logs, I found the following entries: “AH00992: ajp_read_header: ajp_ilink_receive failed”. I could not reproduce them, they just happened. As it turn out, my image of “my” setup was wrong:

    Real Setup: Caller → Apache → Firewall → Tomcat with Webapp

    The firewall kept droping the connection. No reason whatsoever. Since I have no controll over the firewall, I modified the timeouts of the http and the application server:

    For Apache HTTP + MOD_PROXY: ProxyPass Directive

    In Tomcat: Just set the “connectionTimeout” in the AJP connector. Source: JK Timeout Attributes -> Connection Pools and Idle Timeouts

    Chrome Extention: WebRTC Block

    2015-02-02 08:36:00 +0000


    “Disable WebRTC in Your Web Browser! WebRTC (Web Real-Time Communication) is an API definition drafted by the World Wide Web Consortium (W3C) that supports browser-to-browser applications for voice calling, video chat, and P2P file sharing without plugins. WebRTC can disclose your Local IP Addresses and making fingerprints of your Media Devices.”

    WebRTC Chrome Extention

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