我尝试使用 ireport 制作报告,但遇到此问题:
log4j:WARN No appenders could be found for logger(net.sf.jasperreports.extensions.ExtensionsEnvironment). log4j:WARN Please initialize the log4j system properly.
My source:
private URL[] reports = new URL[]{
getClass().getResource("/Laporan/LapGuru.Jasper"),
getClass().getResource("/Laporan/LapGuruByNIP.Jasper"),};
private URL urlCurrent;
try{
Map parameter = new HashMap();
parameter.put("nip",this.txtNIP.getText());
InputStream os = null;
os = urlCurrent.openStream();
JasperReport jReport = (JasperReport)JRLoader.loadObject(os);
JasperPrint jPrint = JasperFillManager.fillReport(jReport, parameter, ClassDB.getkoneksi());
JRViewer viewer = new JRViewer(jPrint);
viewer.setOpaque(true);
viewer.setVisible(true);
jScrollPane1.add(viewer);
jScrollPane1.setViewportView(viewer);
} catch (Exception ex)
{
System.out.println(ex);
}
最佳答案
确保类路径中有 log4j.properties
文件。
如果您想在启动 Java 时将系统属性添加到命令行,还可以使用其他选项来配置 log4j,如下所示:
-Dlog4j.configuration=file:///path/to/your/log4j.properties
查看链接http://logging.apache.org/log4j/1.2/manual.html#defaultInit
关于java - 如何恢复此错误: log4j:WARN No appenders could be found for logger (net. sf.jasperreports.extensions.ExtensionsEnvironment),我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/14142621/