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Why should Java ThreadLocal variables be static
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Either make it static or if you are trying to avoid any static fields in your class - make the class itself a singleton and then you can safely use the an instance level ThreadLocal as long as you have that singleton available globally.
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RequestDispatcher.forward() vs HttpServletResponse.sendRedirect()
...ess them using RequestDispatcher#forward().
You can for example have a JSP file in /WEB-INF/login.jsp and a LoginServlet which is mapped on an url-pattern of /login. When you invoke http://example.com/context/login, then the servlet's doGet() will be invoked. You can do any preprocessing stuff in th...
How to add a filter class in Spring Boot?
...t;/filter-mapping>
These will be the two beans in your @Configuration file
@Bean
public FilterRegistrationBean someFilterRegistration() {
FilterRegistrationBean registration = new FilterRegistrationBean();
registration.setFilter(someFilter());
registration.addUrlPatterns("/url/*")...
POSTing a @OneToMany sub-resource association in Spring Data REST
... an Address and an address MUST be associated with a Venue? I mean...to avoid creating an orphaned address which may never be assigned to anything? Maybe Im wrong, but the client app SHOULD NEVER be responsible maintaining consistency within the database. I cannot rely on client app creating an Addr...
AngularJS: Injecting service into a HTTP interceptor (Circular dependency)
...ying the dependency of $http on the AuthService.
I believe that what you did is actually the simplest way of doing it.
You could also do this by:
Registering the interceptor later (doing so in a run() block instead of a config() block might already do the trick). But can you guarantee that $htt...
What's the point of the X-Requested-With header?
...ss domain:
Accept
Accept-Language
Content-Language
Last-Event-ID
Content-Type
any others cause a "pre-flight" request to be issued in CORS supported browsers.
Without CORS it is not possible to add X-Requested-With to a cross domain XHR request.
If the server is checking that t...
Git fetch remote branch
...ps in the accepted answer, I got the error that pathspec did not match any file(s) known to git., but the rbranch:lbranch approach worked. Interestingly, it also fetched all the tags that started with the same prefix, like it is a wildcard (rbranch*).
– haridsv
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What is the difference between the GNU Makefile variable assignments =, ?=, := and +=?
...dy give a clear explanation of how variable assignment really works in Makefiles.
6 Answers
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Squash my last X commits together using Git
...ing an editor and then searching and replacing for a string in the "to-do" file. Using git merge --squash is also easier to use in a script. Essentially, the reasoning was that you don't need the "interactivity" of git rebase -i at all for this.
– Mark Longair
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Return empty cell from formula in Excel
...uate to trueblank, if you type 0 in A2.
You can download a demonstration file here.
In the example above, evaluating formula to trueblank results in an empty cell. Checking result with ISBLANK formula results positively in TRUE. This is hara-kiri like formula. The formula disappears from cell whe...