xdocreport - How can I generate table in docx with freemarker? -

i'm using xdocreports freemarker template engine generate documents based on template. want generate table java list. code looks this:

    try {         // 1) load docx file filling freemarker template engine , cache         // registry         inputstream in = reportwriter.class.getresourceasstream("/template/teszt_jegyzokonyv_template.docx");         ixdocreport report = xdocreportregistry.getregistry().loadreport(in, templateenginekind.freemarker);          fieldsmetadata metadata = report.createfieldsmetadata();         metadata.load( "testcasegroups", testcasegroup.class, true );         metadata.load( "testcases", testcase.class, true );           // 2) create context java model         icontext context = report.createcontext();          testcasegroup testcasegroup1 = new testcasegroup("testcasegroup1", lists.newarraylist(new testcase("description1"), new testcase("description3")));         testcasegroup testcasegroup2 = new testcasegroup("testcasegroup2", lists.newarraylist(new testcase("description1"), new testcase("description3")));         context.put("testcasegroups", lists.newarraylist(testcasegroup1, testcasegroup2));          // 3) generate report merging java model docx         outputstream out = new fileoutputstream(new file("docxprojectwithfreemarker_out2.docx"));         report.process(context, out);     } catch (ioexception e) {         e.printstacktrace();     } catch (xdocreportexception e) {         e.printstacktrace();     } 

the entities looks this:

public class testcasegroup {  public string name;  public list<testcase> testcases;  public testcasegroup(string name, list<testcase> testcases) {     this.name = name;     this.testcases = testcases; }  public string getname() {     return name; }  public list<testcase> gettestcases() {     return testcases;     } } 

testcase

public class testcase {  public string description;  public testcase(string description) {     this.description = description; }  public string getdescription() {     return description; } } 

the template:

but i've got following exception:

caused by: freemarker.core.invalidreferenceexception: following has evaluated null or missing: ==> testcases

what doing wrong?