Lamba expression – an anonymous function that can be passed to or returned from a method. The most simple case of a lambda is a functional interface with a single method which receives some values and return a value. Actually any interface with a single abstract method can be treated as functional interface. Its implementation is called Lambda expression. So it is…
Could not find saved view state for token j0ej17tvl… What can be the cause?
Problem When observing Weblogic server log files, there are occasional occurancies of Error message: Could not find saved view state for token XXXXXXXXX… Where XXXXXXXXX is randomly generated string for each page post request. This error always comes along with: ADF_FACES-30107:The view state of the page has expired. Reload the page. Some background info Each web page, which posts a request…
A quick Regular expressions (Regex) manual / cheat sheet. Samples.
Obviously regular expressions is a little, but powerful helper to implement various complex requirements. As it is a text search oriented functionality, it is extremely useful in DB based tasks related to data ETL layers, searching and other open text related logic. But it is used entirely everywhere. Almost every text editor support regex search file contents. Its very beneficial…
How to tune JDeveloper memory settings to get better performance?
Thats natural that JDeveloper out of the box comes with minimal settings for resource usage. And obviously it is far away not enough for comfortable usage. So there are at least couple of settings that needs to be tuned right after installation: Java heap size Open file %MW_HOME%/jdeveloper/ide/bin/ide.conf and add/change following two lines Java MaxPermSize Open file %MW_HOME%/jdeveloper/jdev/bin/jdev.conf and add/change following…
After macOS High Sierra system update JDeveloper does not start. How to fix it?
It happens, that each time when I push MacOS High Sierra regular updates, my JDeveloper does not start any more. The fix looks very simple, just need to delete JDeveloper system directory. Sounds frightening, but do not be confused because of naming. By fact it is just operational directory where JDeveloper keeps various temporary and configurational stuff. It is even…
How to keep custom JDeveloper preferences after deleting its system folder?
Time to time it happens, that JDeveloper stops working for some reason. It just not open or behaviour become unstable. The fastest and easiest fix is to delete its system folder. Which is like a temporary one, created on the very first run of JDeveloper. There it keeps various cache information and settings. Among those settings there are user preferences…
How to update existing XML by changing or adding new elements in Oracle DB?
Assuming we have a task to update XML data stored in Oracle database table. Let it be XMLTYPE column. Actually it can either be CLOB or BLOB. Does not make big sense, because can go though conversions to XMLTYPE anyway. Just matter of performance. Here I’ll provide sample, how to proceed in 2 cases: Update XML by changing values in…
How to open file in Source View instead of Design View by default in JDeveloper?
Most of JDeveloper users complain about its performance. There are number of ways to improve it by tuning various parameters in configuration files. If you’ve done it already you might still face long opening of different file types (most common – .jspx, .jsf, .jsff, etc.). That is because JDeveloper is trying to open it in Design View. It tries to…
How to enable debugging of ACL security rules in ServiceNow?
One of the core and powerful features in ServiceNow is ACL (Access Control List) management. Multiple levels of ACL definitions for tables, records and fields might lead into confusing debugging of operations and visibility of certain application areas. Things become easier by leveraging special debugging feature for ACLs. It can be enabled by clicking on: System Security -> Debugging ->…
ServiceNow Certified System Administrator (CSA) exam. Personal experience.
It happened that I’ve passed ServiceNow CSA exam recently. There were 60 questions and 90 minutes. That was completely enough time, because some questions were really short with just True/False answers and took just few seconds to answer. Some were really long with as long answers. Those could take even more than a minute. But long question with long answers…