Jasper Error while building OpenELIS

when build the code : ant dist ,got this:
Error compiling report design : D:\opt\bahmni\OpenElis\openelis\WebContent\WEB-INF\reports\ConfirmationSummary.jrxml

[jrc] net.sf.jasperreports.engine.JRException: Errors were encountered when compiling report expressions class file:[jrc] 1. 
The type java.lang.CharSequence cannot be resolved. It is indirectly referenced from required .class files[jrc] /*[jrc] ^[jrc] 
1 errors[jrc][jrc]     
at net.sf.jasperreports.engine.design.JRAbstractCompiler.compileReport(JRAbstractCompiler.java:191)[jrc]     
at net.sf.jasperreports.engine.JasperCompileManager.compileReport(JasperCompileManager.java:215)[jrc]     
at net.sf.jasperreports.engine.JasperCompileManager.compileReportToFile(JasperCompileManager.java:131)[jrc]     
at net.sf.jasperreports.engine.JasperCompileManager.compileReportToFile(JasperCompileManager.java:113)[jrc]     
at net.sf.jasperreports.ant.JRAntCompileTask.compile(JRAntCompileTask.java:411)[jrc]     
at net.sf.jasperreports.ant.JRAntCompileTask.execute(JRAntCompileTask.java:254)[jrc]     
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:292)[jrc]     
at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)[jrc]     
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)[jrc]     
at java.lang.reflect.Method.invoke(Method.java:498)[jrc]     
at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)[jrc]     
at org.apache.tools.ant.Task.perform(Task.java:348)[jrc]     
at org.apache.tools.ant.Target.execute(Target.java:435)[jrc]     
at org.apache.tools.ant.Target.performTasks(Target.java:456)[jrc]     
at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1393)[jrc]     
at org.apache.tools.ant.Project.executeTarget(Project.java:1364)[jrc]     
at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)[jrc]     
at org.apache.tools.ant.Project.executeTargets(Project.java:1248)[jrc]     
at org.apache.tools.ant.Main.runBuild(Main.java:851)[jrc]     
at org.apache.tools.ant.Main.startAnt(Main.java:235)[jrc]     
at org.apache.tools.ant.launch.Launcher.run(Launcher.java:280)[jrc]     
at org.apache.tools.ant.launch.Launcher.main(Launcher.java:109)[jrc] 
File : D:\opt\bahmni\OpenElis\openelis\WebContent\WEB-INF\reports\Patient_Indeterminate_ByLocation.jrxml ... OK.
Solution: Use JDK 7 for compiling OpenELIS codebase. ELIS (due to some Jasper issues) needs JDK7 to compile. It can be run in JDK8, but cannot be compiled in JDK8 currently.