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https://issues.apache.org/jira/browse/JXPATH-164?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13889271#comment-13889271
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Laurent Malvert commented on JXPATH-164:
----------------------------------------
Sorry, originally I meant to report just the last issue, mostly identified by
this line in the last test:
{code}
assertEquals(4, jxp.selectNodes("/.[*]/EMPNO").size()); // should be 14
{code}
Then I noticed the issues with the "/*/<NAME>". I probably should have opened 2
tickets for that.
> jxpath returns the wrong number of entries if a map contains an empty string
> value
> ----------------------------------------------------------------------------------
>
> Key: JXPATH-164
> URL: https://issues.apache.org/jira/browse/JXPATH-164
> Project: Commons JXPath
> Issue Type: Bug
> Affects Versions: 1.3, 1.4
> Reporter: Laurent Malvert
>
> It's a bit of an odd one, but I've noticed the following strange behaviors
> where JXPath seems to get quite confused when you have an object graph
> containing maps, where the map contains some objects with an
> empty string:
> {code}
> final JXPathContext jxp =
> JXPathContext.newContext(ImmutableList.<Map<String, String>>of(
> ImmutableMap.of(
> "ID", "1",
> "STUFF", ""
> ),
> ImmutableMap.of(
> "ID", "2",
> "STUFF", "42"
> ),
> ImmutableMap.of(
> "ID", "3",
> "STUFF", ""
> )
> ));
> assertEquals(3, jxp.selectNodes("ID").size());
> assertEquals(3, jxp.selectNodes("//ID").size());
> assertEquals(3, jxp.selectNodes("/ID").size());
> assertEquals(3, jxp.selectNodes("/.[*]/ID").size());
> assertEquals(1, jxp.selectNodes("/*/ID").size()); // SHOULD RETURN 3
> {code}
> Now, if you runt the same test with this:
> {code}
> final JXPathContext jxp =
> JXPathContext.newContext(ImmutableList.<Map<String, String>>of(
> ImmutableMap.of(
> "ID", "1"
> ),
> ImmutableMap.of(
> "ID", "2"
> ),
> ImmutableMap.of(
> "ID", "3"
> )
> ));
> assertEquals(3, jxp.selectNodes("ID").size());
> assertEquals(3, jxp.selectNodes("//ID").size());
> assertEquals(3, jxp.selectNodes("/ID").size());
> assertEquals(3, jxp.selectNodes("/.[*]/ID").size());
> assertEquals(0, jxp.selectNodes("/*/ID").size()); // should return 3
> {code}
> Notice how that last result is a 0, whereas we got a one in the first test,
> though the logical structure of the contextbean is the same.
> And now for added fun... The odder thing is that I get slightly different
> behaviors for other seemingly simple datasets.
> For instance, consider this data set converted to an object graph:
> {noformat}
> [ {
> "EMPNO" : "7369",
> "ENAME" : "SMITH",
> "JOB" : "test",
> "MGR" : "7902",
> "HIREDATE" : "Wed Dec 17 05:00:00 GMT 1980",
> "SAL" : "800.0",
> "COMM" : "",
> "DEPTNO" : "20"
> }, {
> "EMPNO" : "7499",
> "ENAME" : "ALLEN",
> "JOB" : "SALESMAN",
> "MGR" : "7698",
> "HIREDATE" : "Fri Feb 20 05:00:00 GMT 1981",
> "SAL" : "1600.0",
> "COMM" : "300.0",
> "DEPTNO" : "30"
> }, {
> "EMPNO" : "7521",
> "ENAME" : "WARD",
> "JOB" : "SALESMAN",
> "MGR" : "7698",
> "HIREDATE" : "Sun Feb 22 05:00:00 GMT 1981",
> "SAL" : "1250.0",
> "COMM" : "500.0",
> "DEPTNO" : "30"
> }, {
> "EMPNO" : "7566",
> "ENAME" : "JONES",
> "JOB" : "MANAGER",
> "MGR" : "7839",
> "HIREDATE" : "Thu Apr 02 06:00:00 BST 1981",
> "SAL" : "2975.0",
> "COMM" : "",
> "DEPTNO" : "20"
> }, {
> "EMPNO" : "7654",
> "ENAME" : "MARTIN",
> "JOB" : "SALESMAN",
> "MGR" : "7698",
> "HIREDATE" : "Mon Sep 28 05:00:00 BST 1981",
> "SAL" : "1250.0",
> "COMM" : "1400.0",
> "DEPTNO" : "30"
> }, {
> "EMPNO" : "7698",
> "ENAME" : "BLAKE",
> "JOB" : "MANAGER",
> "MGR" : "7839",
> "HIREDATE" : "Fri May 01 05:00:00 BST 1981",
> "SAL" : "2850.0",
> "COMM" : "",
> "DEPTNO" : "30"
> }, {
> "EMPNO" : "7782",
> "ENAME" : "CLARK",
> "JOB" : "MANAGER",
> "MGR" : "7839",
> "HIREDATE" : "Tue Jun 09 05:00:00 BST 1981",
> "SAL" : "2450.0",
> "COMM" : "",
> "DEPTNO" : "10"
> }, {
> "EMPNO" : "7788",
> "ENAME" : "SCOTT",
> "JOB" : "ANALYST",
> "MGR" : "7566",
> "HIREDATE" : "Sun Apr 19 05:00:00 BST 1987",
> "SAL" : "3000.0",
> "COMM" : "",
> "DEPTNO" : "20"
> }, {
> "EMPNO" : "7839",
> "ENAME" : "KING",
> "JOB" : "PRESIDENT",
> "MGR" : "",
> "HIREDATE" : "Tue Nov 17 05:00:00 GMT 1981",
> "SAL" : "5000.0",
> "COMM" : "",
> "DEPTNO" : "10"
> }, {
> "EMPNO" : "7844",
> "ENAME" : "TURNER",
> "JOB" : "SALESMAN",
> "MGR" : "7698",
> "HIREDATE" : "Tue Sep 08 05:00:00 BST 1981",
> "SAL" : "1500.0",
> "COMM" : "0.0",
> "DEPTNO" : "30"
> }, {
> "EMPNO" : "7876",
> "ENAME" : "ADAMS",
> "JOB" : "CLERK",
> "MGR" : "7788",
> "HIREDATE" : "Sat May 23 05:00:00 BST 1987",
> "SAL" : "1100.0",
> "COMM" : "",
> "DEPTNO" : "20"
> }, {
> "EMPNO" : "7900",
> "ENAME" : "JAMES",
> "JOB" : "CLERK",
> "MGR" : "7698",
> "HIREDATE" : "Thu Dec 03 05:00:00 GMT 1981",
> "SAL" : "950.0",
> "COMM" : "",
> "DEPTNO" : "30"
> }, {
> "EMPNO" : "7902",
> "ENAME" : "FORD",
> "JOB" : "ANALYST",
> "MGR" : "7566",
> "HIREDATE" : "Thu Dec 03 05:00:00 GMT 1981",
> "SAL" : "3000.0",
> "COMM" : "",
> "DEPTNO" : "20"
> }, {
> "EMPNO" : "7934",
> "ENAME" : "MILLER",
> "JOB" : "CLERK",
> "MGR" : "7782",
> "HIREDATE" : "Sat Jan 23 05:00:00 GMT 1982",
> "SAL" : "1300.0",
> "COMM" : "",
> "DEPTNO" : "10"
> } ]
> {noformat}
> {code}
> final JXPathContext jxp = JXPathContext.newContext(employeeList);
> assertEquals(14, jxp.selectNodes("EMPNO").size());
> assertEquals(14, jxp.selectNodes("//EMPNO").size());
> assertEquals(4, jxp.selectNodes("/.[*]/EMPNO").size()); // should be
> 14
> assertEquals(14, jxp.selectNodes("/EMPNO").size());
> assertEquals(0, jxp.selectNodes("/*/EMPNO").size()); // should also
> be 14
> {code}
> Here we notice that the last result is wrong again as well... but the index
> based one is wrong as well. And it seems like it's only returning entries
> where all map values where non-empty.
> Not sure if there's something I'm not getting, but it looks like something
> isn't quite right here.
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