Computer paradigms

Programming languages / configuration

Talend: what does "Component variable are used in the copied elements" mean?


On Talend Studio, you may get the message "Component variables are used in copied elements, do you want to rename them automatically?" when copying and pasting components. What does this message actually mean? The...

Talend : bind variables in SQL query


Problem exposed. On Talend, there is no SQL component allowing to make a select query prepared with the binding of variables, as on dBeaver. It would indeed be interesting to be able to make a request as below, by...

Allow geolocation in HTTP


If you develop a website locally, you do not necessarily use an SSL certificate. Unfortunately, this blocks certain features, such as geolocation. Here's how to work around the problem.

Talend: fix "Plugin X or one of its dependencies could not be resolved"


On Talend, you can have the following exception: "An error occurred (java.lang.Exception: [ERROR] Plugin X or one of its dependencies could not be resolved: Cannot access central (https://repo1.maven.org/maven2/) in...

Talend: avoid modifying context variables during a job


On Talend software, on a job, it's possible to assign the value of a context variable, via a tJava, by writing for example: context.myVariable="abc";There is no error and most of the time it goes very well. Except...

Fix "Unknown: failed to open stream: No such file or directory in Unknown on line 0"


While viewing your website, you may have the following two errors displayed: Warning: Unknown: failed to open stream: No such file or directory in Unknown on line 0 Fatal error: Unknown: Failed opening required...

Fix Talend when it's not using the right execution context


It may happen that Talend Open Studio does not use the correct execution context. Typically, you run it on the pre-production context, and the variables it uses are NULL or unexpected values. This can cause for...

Wait for the end of a process in a Batch file

Scripts Batch / VBS

In a batch process which calls an executable, you may need to prevent this executable from being launched more than once if the batch is restarted. It is then interesting to wait for the end of the process or to...

Using multi-threading on Talend


Threads are a way of distributing the processing load over several calculation units. Talend offers the possibility of launching multi-threaded sub-jobs, in order to parallelize the executions. Here is a proposal...

Tips on Talend


Some techniques and code snippets that can help on Talend projects.

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