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…
D in SOLID – Dependency Inversion Principle. Short explanation with example.
Here are 3 statements, all of which means the same thing: Depend upon Abstractions. Do not depend upon concretions. High-level modules should not depend on low-level modules. Both should depend on abstractions. Abstractions should not depend on details. Details should depend on abstractions. This principle was introduced by Robert Martin together with the rest 4 SOLID principles. In my opinion it…
I in SOLID – Interface Segregation Principle. Short explanation with example.
Clients should not be forced to depend upon interfaces that they do not use Rober Martin This principle, similar to Single Responsibility Principal, is about avoiding redundant code changes when requirements change. Following this principle will save you from changing existing classes, allows to add extra functionality with just an extra class. We could also redefine this principle like this:…