'Internal Server Error java.lang.NoClassDefFoundError Could not initialize class org.jfree.chart.JFreeChart' when Viewing Chart Gadget
Platform Notice: Data Center Only - This article only applies to Atlassian products on the Data Center platform.
Note that this KB was created for the Data Center version of the product. Data Center KBs for non-Data-Center-specific features may also work for Server versions of the product, however they have not been tested. Support for Server* products ended on February 15th 2024. If you are running a Server product, you can visit the Atlassian Server end of support announcement to review your migration options.
*Except Fisheye and Crucible
Symptoms
An Internal Server Error message appears in a chart-based gadget.
The following appears in the atlassian-jira.log:
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SEVERE: Internal server error
java.lang.NoClassDefFoundError: Could not initialize class org.jfree.chart.JFreeChart
at org.jfree.chart.ChartFactory.createStackedBarChart(ChartFactory.java:679)
at com.atlassian.jira.charts.jfreechart.StackedBarChartGenerator.generateChart(StackedBarChartGenerator.java:48)
at com.atlassian.jira.charts.RecentlyCreatedChart.generateChart(RecentlyCreatedChart.java:91)
Cause
Generally, a NoClassDefFoundError occurs when a plugin is compiled against a JIRA version, then deployed against a different JIRA version that lacks a specific class definition.
In some cases, the versions may be correct, and an environment classloading issue has caused the error.
Resolution
Restart JIRA. This will correct the environmental class-loading issue.
Check that the Charting Plugin is compatible with the installed version of JIRA.
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