java - StackTraceElement for tracking an exception -

this 1 little bit tough explain, sorry long question!

i have method indexof(string node) looks in string-array , returns index-position or throws exception if can't find node-string in array.

this method used in addedge(string node1, string node2) call addedge(int index1, int index2).

protected string[] nodes; protected boolean[][] adjacencymatrix;  protected int indexof(string node) throws graphexception {     (int = 0; < nodes.length; i++) {         if (node.equals(nodes[i])) {             return i;         }     }     system.out.println("exception in indexof(string node)");     throw new graphexception(); }  public void addedge(int index1, int index2) throws graphexception {     if ((index1 != index2) && (index1 < this.nodes.length) && (index2 < this.nodes.length)) {         this.adjacencymatrix[index1][index2] = true;         this.adjacencymatrix[index2][index1] = true;     } else {         system.out.println("exception in addedge(int index1, int index2)");         throw new graphexception();     } }  public void addedge(string node1, string node2) throws graphexception {     try {         this.addedge(this.indexof(node1), this.indexof(node2));      } catch (graphexception e) {         system.out.println("exception in addedge(string node1, string node2)");         throw new graphexception();     } } 

for testing purposes, have implemented array myarray = {"foo", "foo2", "bar"}. now, when try provoke exception, like:

try {         addedge("foo", "foobar");      } catch (graphexception e) {         (stacktraceelement st : e.getstacktrace()) {             system.out.println("method: " + st.getmethodname() + " line: " + st.getlinenumber());         }     } 

the console-output is:

exception in indexof(string node) exception in addedge(string node1, string node2) method: addedge line: 169 method: main line: 221 

ok, here's question:

apperently, exception must have been thrown in indexof(string node) first time, since there no matching "foobar" string in nodes-array.

that's explaining first .println: exception in indexof(string node).

so, there reason stack missing out first position exception gets thrown?

i have expected stack:

method: indexof line: 58 method: addedge line: 169 method: main line: 221 

thank you!

your exception being caught in addedge(string, string) , rethrown, that's stacktrace starts.

if want preserve actual initiating stacktrace, you'll have modify graphexception can carries previous exception:

throw new graphexception (e);