In the previous post, we discuss own we change from using mongorepository to using directly mongodb method to access and modify directly the object in db.In this posts we look at code that was deleting with mongorepository and change it to use directly mongodb method with MongoTemplate. Using MongoTemplate is faster and less likely to […]
We had at work a piece of code that was using mongorepository and updating the arrays of the object on a collection instead of using mongodb method directly.The way it was coded had a big issues with concurrency and we were losing update because of it.The problem we had with the way it was updating […]
This is old news, but having work with big bank and insurance companies they tend to stick with the old version of java and they’re underlying libraries, I’ve finally been expose to new ways of testing exception with junit. I use to test exception by adding an expected right after the @Test annotation.@Test(expected = NullpointerException) […]
Once upon a time an engineer with years of experience encounter something so basic he doesn’t understand why he didn’t encounter it sooner. This week we had a strange error in our log stating that should have a null values in a map. After some digging in the service where that log was found, it […]
I was having that weird error when I was working with mapstruct, turn out that the default java version for mapstruct is java 6. Since our project was in java 11 I was getting the error “Constructor XXX in enum XXX cannot be applied to given types”. My starting config was : <dependencies> <dependency> <groupId>org.mapstruct</groupId> […]
While trying to remove a element after creating a List from a array using the Array.asList(array[]) method I’ve stumbled on that error. java.lang.UnsupportedOperationException at java.util.AbstractList.add(AbstractList.java:131) at java.util.AbstractList.add(AbstractList.java:91) Then I remember this, list created by the Arrays.asList method are immutable Same goes for empty lists. So instead create a arraylist : List<String> list = new ArrayList<String>(Arrays.asList(split));
Comparing and sorting Strings might not work out like you expected specially when your dealing with a language other than English. Normally comparing strings in done with simple Unicode ordering. If you want to have localized ordering (the kind expected by an end user) you need to use a Collator. Commonly used String methods such […]
If you happen to rename your folder that contain your jsp and js, don’t forget to update the struts config (and the tiles). This will save your precious time even hours …
I’ve stumbled upon that problem recently and couldn’t remember how to do it. Has you except it’s trivial to do and like most of what can be done in programming there more than one way to do it. 1- Good old jdk String 🙂 Since Java 1.5 you have the new String format method do […]
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