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Could not initialize class org.jfree.chart.JFreeChart

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Hi

I am trying to run a report on biserver-ce-6.0.1 with a bar line chart and I am getting the error showed below.





Code:

Caused by: java.lang.NoClassDefFoundError: Could not initialize class org.jfree.chart.JFreeChart        at org.jfree.chart.ChartFactory.createBarChart(ChartFactory.java:893)
        at org.pentaho.plugin.jfreereport.reportcharts.BarChartExpression.computeCategoryChart(BarChartExpression.java:100)
        at org.pentaho.plugin.jfreereport.reportcharts.BarLineChartExpression.computeCategoryChart(BarLineChartExpression.java:362)
        at org.pentaho.plugin.jfreereport.reportcharts.CategoricalChartExpression.computeChart(CategoricalChartExpression.java:425)
        at org.pentaho.plugin.jfreereport.reportcharts.AbstractChartExpression.getValue(AbstractChartExpression.java:490)
        at org.pentaho.reporting.engine.classic.core.function.sys.AttributeExpressionsEvaluator.evaluate(AttributeExpressionsEvaluator.java:185)
        at org.pentaho.reporting.engine.classic.core.function.sys.AttributeExpressionsEvaluator.evaluateElement(AttributeExpressionsEvaluator.java:123)
        at org.pentaho.reporting.engine.classic.core.function.AbstractElementFormatFunction.processBand(AbstractElementFormatFunction.java:565)
        at org.pentaho.reporting.engine.classic.core.function.AbstractElementFormatFunction.processRootBand(AbstractElementFormatFunction.java:536)
        at org.pentaho.reporting.engine.classic.core.function.AbstractElementFormatFunction.reportStarted(AbstractElementFormatFunction.java:174)
        at org.pentaho.reporting.engine.classic.core.states.datarow.ExpressionEventHelper.fireReportStartedEvent(ExpressionEventHelper.java:369)
        at org.pentaho.reporting.engine.classic.core.states.datarow.ExpressionEventHelper.fireReportEvent(ExpressionEventHelper.java:58)
        at org.pentaho.reporting.engine.classic.core.states.SubLayoutProcess.fireReportEvent(SubLayoutProcess.java:162)


According to several post I found I set already the CATALINA_OPTS="-Djava.awt.headless=true" environment variable but it didn't fix the problem.

Below some information about my environment
Ubuntu 15.10
biserver-ce-6.0.1


JAVA_HOME="/usr/lib/jvm/java-1.8.0-openjdk-amd64"
PENTAHO_JAVA_HOME="/usr/lib/jvm/java-1.8.0-openjdk-amd64"


Please, would you have any suggestion?

Thank you.

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