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  1. ,
    Expert tip

    Check if you didn't forget to instantiate your topic in the kafka broker.

  2. ,

    This error comes up in the old version of spring-test , you should update tospring test 4.3.2

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org/apache/commons/collections/ReferenceMap
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org/apache/commons/collections/ReferenceMap
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java.lang.ClassNotFoundException: org.apache.commons.collections.map.ReferenceMap	at java.net.URLClassLoader$1.run(URLClassLoader.java:366)	at java.net.URLClassLoader$1.run(URLClassLoader.java:355)	at java.security.AccessController.doPrivileged(Native Method)	at java.net.URLClassLoader.findClass(URLClassLoader.java:354)	at java.lang.ClassLoader.loadClass(ClassLoader.java:425)	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)	at java.lang.ClassLoader.loadClass(ClassLoader.java:358)	at net.sf.jasperreports.engine.design.JRAbstractJavaCompiler.(JRAbstractJavaCompiler.java:74)	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)	at java.lang.reflect.Constructor.newInstance(Constructor.java:526)	at net.sf.jasperreports.engine.JasperCompileManager.getCompiler(JasperCompileManager.java:823)	at net.sf.jasperreports.engine.JasperCompileManager.getEvaluator(JasperCompileManager.java:380)	at net.sf.jasperreports.engine.fill.JRFillDataset.createCalculator(JRFillDataset.java:467)	at net.sf.jasperreports.engine.fill.BaseReportFiller.(BaseReportFiller.java:152)	at net.sf.jasperreports.engine.fill.JRBaseFiller.(JRBaseFiller.java:236)	at net.sf.jasperreports.engine.fill.JRVerticalFiller.(JRVerticalFiller.java:72)	at net.sf.jasperreports.engine.fill.JRVerticalFiller.(JRVerticalFiller.java:60)	at net.sf.jasperreports.engine.fill.JRFiller.createBandReportFiller(JRFiller.java:201)	at net.sf.jasperreports.engine.fill.JRFiller.createReportFiller(JRFiller.java:216)	at net.sf.jasperreports.engine.fill.JRFiller.fill(JRFiller.java:85)	at net.sf.jasperreports.engine.JasperFillManager.fill(JasperFillManager.java:456)	at net.sf.jasperreports.engine.JasperFillManager.fill(JasperFillManager.java:417)	at net.sf.jasperreports.engine.JasperFillManager.fillReport(JasperFillManager.java:838)	at id.hans.employee.application.MainApplication.showReport(MainApplication.java:59)	at id.hans.employee.application.MainApplication.main(MainApplication.java:83)