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java.lang.NullPointerException at java.io.ObjectInputStream$PeekInputStream.read(ObjectInputStream.java:2283) at java.io.ObjectInputStream$PeekInputStream.readFully(ObjectInputStream.java:2296) at java.io.ObjectInputStream$BlockDataInputStream.readShort(ObjectInputStream.java:2767) at java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:798) at java.io.ObjectInputStream.<init>(ObjectInputStream.java:298) at net.sf.jasperreports.engine.util.ContextClassLoaderObjectInputStream.<init>(ContextClassLoaderObjectInputStream.java:53) at net.sf.jasperreports.engine.util.JRLoader.loadObject(JRLoader.java:200) at net.sf.jasperreports.engine.JasperFillManager.fillReport(JasperFillManager.java:376) at laporanbelajar.LaporanBelajar.showReport(LaporanBelajar.java:55) at laporanbelajar.LaporanBelajar.main(LaporanBelajar.java:80)