Estou trabalhando com um projeto Maven e gerei um impresso utilizando o IReports, porém ao fazer a chamada do mesmo é retornado java.lang.NullPointerException ao tentar detalhar onde estava o erro notei que ocorre nesta linha InputStream relatorio = getClass().getResourceAsStream("/impresso/ImpressoContaConsumo.jasper");, achei que poderia ser algo com o arquivo, porém ao tentar usar o mesmo relatório em um projeto que não é Maven ele abre sem problemas e ao tentar executar um relatório simples sem parâmetros ele apresenta o mesmo problema.
Segue o código abaixo.
Impressos.java
try {
InputStream relatorio = getClass().getResourceAsStream("/impresso/ImpressoContaConsumo.jasper");
List<Relatorio> Conta = getListaConta(dataEmissao, mesReferencia, vencimento, totalPagar, nomePredio, endereco,
numero, bairro, complemento, cidade, uf, cep, dataLeitura, leituraInicial, leituraFinal,
volumeMC, volumeKG, dataFaturamento, descricaoFaturamento, totalFaturamento, fatorConversao,
valorUnitario, volumeMCFC, volumeKGFC, diasConsumo);
JRBeanCollectionDataSource ds = new JRBeanCollectionDataSource(Conta);
Map<String, Object> parametros = new HashMap<String, Object>();
JasperPrint impressao = null;
impressao = JasperFillManager.fillReport(relatorio, parametros, ds);
JasperViewer viewer = new JasperViewer(impressao, false);
viewer.setVisible(true);
} catch (JRException e) {
JOptionPane.showMessageDialog(null, e.getMessage());
e.printStackTrace();
}
Erro
ava.lang.NullPointerException
at java.base/java.io.ObjectInputStream$PeekInputStream.read(ObjectInputStream.java:2872)
at java.base/java.io.ObjectInputStream$PeekInputStream.readFully(ObjectInputStream.java:2888)
at java.base/java.io.ObjectInputStream$BlockDataInputStream.readShort(ObjectInputStream.java:3385)
at java.base/java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:942)
at java.base/java.io.ObjectInputStream.<init>(ObjectInputStream.java:385)
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:603)
at br.com.agil.condominio.controle.Impressos.RelatorioVenda(Impressos.java:59)
at br.com.agil.condominio.view.FrameLancaConsumo.GeraConta(FrameLancaConsumo.java:403)
at br.com.agil.condominio.view.FrameLancaConsumo.BtConsUnidade1ActionPerformed(FrameLancaConsumo.java:221)
at br.com.agil.condominio.view.FrameLancaConsumo.access$300(FrameLancaConsumo.java:28)
at br.com.agil.condominio.view.FrameLancaConsumo$5.actionPerformed(FrameLancaConsumo.java:143)
at java.desktop/javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1967)
at java.desktop/javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2308)
at java.desktop/javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:405)
at java.desktop/javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:262)
at java.desktop/javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:279)
at java.desktop/java.awt.Component.processMouseEvent(Component.java:6636)
at java.desktop/javax.swing.JComponent.processMouseEvent(JComponent.java:3342)
at java.desktop/java.awt.Component.processEvent(Component.java:6401)
at java.desktop/java.awt.Container.processEvent(Container.java:2263)
at java.desktop/java.awt.Component.dispatchEventImpl(Component.java:5012)
at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2321)
at java.desktop/java.awt.Component.dispatchEvent(Component.java:4844)
at java.desktop/java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4919)
at java.desktop/java.awt.LightweightDispatcher.processMouseEvent(Container.java:4548)
at java.desktop/java.awt.LightweightDispatcher.dispatchEvent(Container.java:4489)
at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2307)
at java.desktop/java.awt.Window.dispatchEventImpl(Window.java:2764)
at java.desktop/java.awt.Component.dispatchEvent(Component.java:4844)
at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:772)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:715)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:95)
at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:745)
at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:743)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:742)
at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
Detalhe do biblioteca Maven importada no projeto para uso do JasperReports
`<dependency>
<groupId>net.sf.jasperreports</groupId>
<artifactId>jasperreports</artifactId>
<version>3.7.5</version>
</dependency>`