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我試圖產生一個PDF與JasperReports。錯誤實例化擴展註冊表chart.theme
在第一時間我試試，我得到這個錯誤：
ERROR [net.sf.jasperreports.extensions.DefaultExtensionsRegistry] Error instantiating extensions registry for chart.theme
from vfszip:My-App.ear/lib/jasperreports-chart-themes-4.7.0.jar/jasperreports_extension.properties
org.springframework.beans.factory.parsing.BeanDefinitionParsingException: Configuration problem:
Failed to import bean definitions from relative location [defaultChartPropertiesBean.xml]
Offending resource: URL
[My-App.ear/lib/jasperreports-chart-themes-4.7.0.jar/net/sf/jasperreports/chartthemes/spring/beans/chartThemesBeans.xml];
nested exception is org.springframework.beans.factory.parsing.BeanDefinitionParsingException: Configuration problem:
Failed to import bean definitions from relative location [chartConstantsBean.xml]
Offending resource: URL
[My-App.ear/lib/jasperreports-chart-themes-4.7.0.jar/net/sf/jasperreports/chartthemes/spring/beans/defaultChartPropertiesBean.xml];
nested exception is org.springframework.beans.factory.BeanDefinitionStoreException: Unexpected exception parsing XML document from URL
[My-App.ear/lib/jasperreports-chart-themes-4.7.0.jar/net/sf/jasperreports/chartthemes/spring/beans/chartConstantsBean.xml];
nested exception is org.springframework.beans.FatalBeanException:
Class [org.springframework.beans.factory.xml.UtilNamespaceHandler] for namespace
[http://www.springframework.org/schema/util] does not implement the [org.springframework.beans.factory.xml.NamespaceHandler] interface
at org.springframework.beans.factory.parsing.FailFastProblemReporter.error(FailFastProblemReporter.java:68)
at org.springframework.beans.factory.parsing.ReaderContext.error(ReaderContext.java:85)
at org.springframework.beans.factory.parsing.ReaderContext.error(ReaderContext.java:76)
at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.importBeanDefinitionResource(DefaultBeanDefinitionDocumentReader.java:219)
at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseDefaultElement(DefaultBeanDefinitionDocumentReader.java:148)
at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:133)
at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.registerBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:93)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.registerBeanDefinitions(XmlBeanDefinitionReader.java:493)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:390)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:334)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:302)
at org.springframework.beans.factory.xml.XmlBeanFactory.<init>(XmlBeanFactory.java:73)
at org.springframework.beans.factory.xml.XmlBeanFactory.<init>(XmlBeanFactory.java:61)
at net.sf.jasperreports.extensions.SpringExtensionsRegistryFactory.getBeanFactory(SpringExtensionsRegistryFactory.java:101)
然而，沒有任何問題產生PDF。
另外，下次我嘗試生成一個PDF，沒有更多的錯誤。這隻發生在第一代。
是什麼原因？我怎樣才能避免這個錯誤？