jasper reports - How JasperReports display CLOB field with HTML tags -

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i want show value in detail band. line oracle db data type clob , value contain html tag

i error message:

error filling print... error evaluating expression :      source text : $f{discharge_text}.getsubstring( 1l, ( new long( $f{discharge_text}.length() ) ).intvalue())  net.sf.jasperreports.engine.fill.jrexpressionevalexception: error evaluating expression :       source text : $f{discharge_text}.getsubstring( 1l, ( new long( $f{discharge_text}.length() ) ).intvalue())       at net.sf.jasperreports.engine.fill.jrevaluator.evaluate(jrevaluator.java:195)       at net.sf.jasperreports.engine.fill.jrcalculator.evaluate(jrcalculator.java:589)       at net.sf.jasperreports.engine.fill.jrcalculator.evaluate(jrcalculator.java:557)       at net.sf.jasperreports.engine.fill.jrfillelement.evaluateexpression(jrfillelement.java:929)       at net.sf.jasperreports.engine.fill.jrfilltextfield.evaluatetext(jrfilltextfield.java:383)       at net.sf.jasperreports.engine.fill.jrfilltextfield.evaluate(jrfilltextfield.java:368)       at net.sf.jasperreports.engine.fill.jrfillelementcontainer.evaluate(jrfillelementcontainer.java:258)       at net.sf.jasperreports.engine.fill.jrfillband.evaluate(jrfillband.java:499)       at net.sf.jasperreports.engine.fill.jrverticalfiller.fillcolumnband(jrverticalfiller.java:2033)       at net.sf.jasperreports.engine.fill.jrverticalfiller.filldetail(jrverticalfiller.java:760)       at net.sf.jasperreports.engine.fill.jrverticalfiller.fillreportstart(jrverticalfiller.java:270)       at net.sf.jasperreports.engine.fill.jrverticalfiller.fillreport(jrverticalfiller.java:128)       at net.sf.jasperreports.engine.fill.jrbasefiller.fill(jrbasefiller.java:946)       at net.sf.jasperreports.engine.fill.jrbasefiller.fill(jrbasefiller.java:845)       at net.sf.jasperreports.engine.fill.jrfiller.fillreport(jrfiller.java:58)       at net.sf.jasperreports.engine.jasperfillmanager.fillreport(jasperfillmanager.java:417)       at net.sf.jasperreports.engine.jasperfillmanager.fillreport(jasperfillmanager.java:247)       at com.jaspersoft.ireport.designer.compiler.ireportcompiler.run(ireportcompiler.java:877)       at org.openide.util.requestprocessor$task.run(requestprocessor.java:572)       at org.openide.util.requestprocessor$processor.run(requestprocessor.java:997)   caused by: java.lang.classcastexception: oracle.sql.clob cannot be cast to oracle.sql.clob       at testreport_1377507739843_118503.evaluate(testreport_1377507739843_118503:199)       at net.sf.jasperreports.engine.fill.jrevaluator.evaluate(jrevaluator.java:182)      ... 19 more   print not filled. try use emptydatasource...

i applied failed run report

$f{discharge_text}.getsubstring( 1l, ( new long( $f{discharge_text}.length() ) ).intvalue())

jrxml is 

<?xml version="1.0" encoding="utf-8"?> <jasperreport xmlns="http://jasperreports.sourceforge.net/jasperreports" xmlns:xsi="http://www.w3.org/2001/xmlschema-instance" xsi:schemalocation="http://jasperreports.sourceforge.net/jasperreports http://jasperreports.sourceforge.net/xsd/jasperreport.xsd" name="report1" language="groovy" pagewidth="595" pageheight="842" columnwidth="555" leftmargin="20" rightmargin="20" topmargin="20" bottommargin="20" uuid="c9787a67-b067-4421-a7b5-e13d0e6785d8">     <property name="ireport.zoom" value="1.0"/>     <property name="ireport.x" value="0"/>     <property name="ireport.y" value="0"/>     <querystring language="sql">         <![cdata[select discharge_text  ip_discharge  admission_no='a011303011860']]>     </querystring>     <field name="discharge_text" class="oracle.sql.clob"/>     <background>         <band splittype="stretch"/>     </background>     <title>         <band height="79" splittype="stretch"/>     </title>     <pageheader>         <band height="35" splittype="stretch"/>     </pageheader>     <columnheader>         <band height="61" splittype="stretch">             <statictext>                 <reportelement uuid="ac99f9c5-28bf-410d-aee2-8ad5bdb95708" x="293" y="2" width="100" height="20"/>                 <textelement/>                 <text><![cdata[discharge_text]]></text>             </statictext>         </band>     </columnheader>     <detail>         <band height="125" splittype="stretch">             <textfield>                 <reportelement uuid="9d6fdb47-3f70-4620-9cf8-17fcc2be4da8" x="293" y="55" width="100" height="20"/>                 <textelement/>                 <textfieldexpression><![cdata[$f{discharge_text}.getsubstring( 1l, ( new long( $f{discharge_text}.length() ) ).intvalue())]]></textfieldexpression>             </textfield>         </band>     </detail>     <columnfooter>         <band height="45" splittype="stretch"/>     </columnfooter>     <pagefooter>         <band height="54" splittype="stretch"/>     </pagefooter>     <summary>         <band height="42" splittype="stretch"/>     </summary> </jasperreport>


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