This to me sounds like a reasonably common problem that junior to intermediate developers tend to face at some point: they either don’t know or don’t trust the contracts they are participating in and defensively overcheck for nulls. Additionally, when writing their own code, they tend to rely on returning nulls to indicate something thus … Read more
The FacesContext is stored as a ThreadLocal variable in the thread responsible for the HTTP request which invoked the FacesServlet, the one responsible for creating the FacesContext. This thread usually goes through the JSF managed bean methods only. The FacesContext is not available in other threads spawned by that thread. You should actually also not … Read more
I found a fix (not my work) that makes it work for Samsung devices. The blog with explanation can be found here. However, using this fix on non-Samsung phones returns the wrong image, so I would use an if(imageURI != null) { // do it the normal way else { // do it the “Samsung” … Read more
If you’re using Hibernate 4 and trying to create a EntityManagerFactory manually (or SessionFactory) declared as <jta-datasource>, there is a property you must set on your persistence.xml called hibernate.transaction.jta.platform. For using on JBoss 7 <property name=”hibernate.transaction.jta.platform” value=”org.hibernate.service.jta.platform.internal.JBossAppServerJtaPlatform” /> I found about this property at Hibernate Docs
The array in your ArrayAdapter contains at least one entry that is null. There must be no nulls there. The array is populated in getDiaryDBDataList() so the problem is also there.
Here’s the relevant quote from the spec (§15.25.2): Boolean conditional expressions are standalone expressions (§15.2). The type of a boolean conditional expression is determined as follows: If the second and third operands are both of type Boolean, the conditional expression has type Boolean. Otherwise, the conditional expression has type boolean. Therefore, the overall expression’s type … Read more
Since this question is looked up quite often and I stumbled across the very same problem again and again here is a little follow up that keeps track of all necessary steps to create a SearchWidget. There is one tricky part about the SearchWidget though: If you use hardcoded Strings in the searchable.xml instead of … Read more
NPE is the most useless Exception in Java, period. It seems to be always lazily implemented and never tells exactly what caused it, even as simple as “class x.y.Z is null” would help a lot in debugging such cases. Anyway, the only good way I’ve found to find the NPE thrower in these cases is … Read more
There is no standard @NonNull annotation. Creating such an annotation was the goal of JSR 305, which has been abandoned for a long time. There will not be a standard @NonNull annotation until JSR 305 is reconstituted. Oracle has no current plans to do so. (JEE annotations are outside the scope of JSR 305.) For … Read more