java net.sf.jasperreports.engine.JRException：从文件加载对象时出错
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net.sf.jasperreports.engine.JRException: Error loading object from file
提问by Abdh-Allah
I am using jasper to display report for my project...Actually i m trying to pass the parameters dynamically to jrxml template as i saw in the link given below but i couldnt.....There seems a problem in my code the error is
我正在使用 jasper 来显示我的项目的报告......实际上我试图将参数动态传递给 jrxml 模板，正如我在下面给出的链接中看到的，但我不能......我的代码中似乎有问题，错误是
net.sf.jasperreports.engine.JRException: Error loading object from file : C:\Users\db2admin\Documents\NetBeansProjects\ConnectDB\src\sample_report.jrxml
at net.sf.jasperreports.engine.util.JRLoader.loadObject(JRLoader.java:115)
at net.sf.jasperreports.engine.JasperFillManager.fillToFile(JasperFillManager.java:487)
at net.sf.jasperreports.engine.JasperFillManager.fillReportToFile(JasperFillManager.java:874)
at ConnectDB.main(ConnectDB.java:65)
Caused by: java.io.StreamCorruptedException: invalid stream header: 3C3F786D
at java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:801)
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:110)
... 3 more
the jasper snippet is
碧玉片段是
ResultSet resultSet = statement.executeQuery("SELECT reg, name FROM students");
JRResultSetDataSource resultSetDataSource = new JRResultSetDataSource(resultSet);
JasperFillManager.fillReportToFile("C:\Users\db2admin\Documents\NetBeansProjects\
ConnectDB\src\sample_report.jrxml", null, resultSetDataSource);
Finally the xml code is
最后的xml代码是
<?xml version="1.0" encoding="UTF-8"?>
<jasperReport xmlns="http://jasperreports.sourceforge.net/jasperreports" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports http://jasperreports.sourceforge.net/xsd/jasperreport.xsd" name="sample_report" pageWidth="595" pageHeight="842" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="30" bottomMargin="30" uuid="b3b98795-b21f-4006-9295-5ef4248c84ea">
<property name="ireport.zoom" value="1.0"/>
<property name="ireport.x" value="0"/>
<property name="ireport.y" value="0"/>
<field name="name" class="java.lang.String"/>
<field name="reg" class="java.lang.Integer"/>
<columnHeader>
<band height="28" splitType="Stretch">
<staticText>
<reportElement uuid="6d6bff96-6dcb-4188-bdc0-5c23b2614b05" key="staticText-1" x="40" y="11" width="196" height="15"/>
<textElement/>
<text><![CDATA[Name]]>
</text>
</staticText>
<staticText>
<reportElement uuid="c0267b29-e31b-4afd-a181-86bbcb4fb368" key="staticText-2" x="330" y="11" width="193" height="15"/>
<textElement/>
<text><![CDATA[Reg]]>
</text>
</staticText>
</band>
</columnHeader>
<detail>
<band height="27" splitType="Stretch">
<textField>
<reportElement uuid="4a1e6484-9610-421d-b4a4-f61d53458d9e" key="textField" x="47" y="6" width="173" height="18"/>
<textElement/>
<textFieldExpression><![CDATA[$F{name}]]>
</textFieldExpression>
</textField>
<textField>
<reportElement uuid="01cb3d91-74e7-4594-aca0-605d1aa203a8" key="textField" x="330" y="6" width="100" height="18"/>
<textElement/>
<textFieldExpression><![CDATA[$F{reg}]]>
</textFieldExpression>
</textField>
</band>
</detail>
</jasperReport>
I referred this site http://www.packtpub.com/article/creating-dynamic-reports-from-databases-jasperreports-3.5
我提到了这个网站 http://www.packtpub.com/article/creating-dynamic-reports-from-databases-jasperreports-3.5
Plz help me with this!!!!
请帮我解决这个问题！！！！
回答by andhdo
If you are working in ireport, review that your subreports are referencing to the .jasper file (not the jrxml).
如果您在 ireport 中工作，请检查您的子报告是否引用了 .jasper 文件（而不是 jrxml）。
If you are publising your report to the jasperreports-server, take in mind that it does a changes in the report definition referencing the jrxml files with a prefix (but not the jasper files).
如果您将报告发布到 jasperreports-server，请记住，它会更改报告定义中引用带有前缀的 jrxml 文件（但不是 jasper 文件）。
