Java: The import org.apache.commons.lang cannot be resolved [Eclipse]

Question

I've been handed a java project for modification, so I went ahead and decided to set it up in my MacBook. I loaded the project into Eclipse (Luna), imported and added all the external jars necessary, and pretty much tried to copy the old setup.

Then, I get this:

Which is weird, because I could've sworn I added that as a JAR (same one from the old setup): Oh, wait. There it is.

Now, according to this, which may or may not apply, as it is NetBeans (not sure if there's much of a difference), I should use org.apache.commons.lang3.StringEscapeUtils;

Which, however, gives me this:

EDIT: Here's the part of the code that uses the StringEscapeUtils:

Sorry if this seems trivial, but I'm kinda stumped. Can anyone help? Thanks.

EDIT: It would appear that in trying to solve this problem, I ran into a different one. After changing the org.apache.commons.lang.StringEscapeUtils; into org.apache.commons.lang3.StringEscapeUtils; , I noticed the error also says Unable to load realm info from SCDynamic store .

At this point, I'm not sure if I did solve the previous error, or not, as I probably need to fix this new error to proceed.

Answer 1

Fortunately or unfortunately your other libraries require an older version of your commons lang. That is, other libraries (like hadoop) may have a dependency on apache commons 2 library So include the older version commons-lang-2.x version library and it should work fine.

Check this Apache Hadoop dependency link:

http://hadoop.apache.org/docs/stable/hadoop-project-dist/hadoop-common/dependency-analysis.html

There is a dependency on commons-lang version 2.6. So include that library in your eclipse classpath