I am new to Eclipse. I tried to build a project but I got the
following error. I assume that it is environment issue. Any help would
be apprecitated.

Buildfile: E:\Eclipse\WorkSpace\HelloWorld\build.xml
cleanup:
  [delete] Deleted 2 directories from E:\Eclipse\WorkSpace\HelloWorld
\classes.ant
clean:
precompile:
init:
   [mkdir] Created dir: E:\Eclipse\WorkSpace\HelloWorld\classes.ant
   [mkdir] Created dir: E:\Eclipse\WorkSpace\HelloWorld\classes.ant
\Temporary_Files
javacompile:
   [javac] Compiling 2 source files to E:\Eclipse\WorkSpace\HelloWorld
\classes.ant
   [javac] Fatal Error: Unable to locate package java.lang in
classpath or bootclasspath

BUILD FAILED
E:\Eclipse\WorkSpace\HelloWorld\build.xml:68: Compile failed; see the
compiler error output for details.

Total time: 3 seconds