Java – PDF generated from JAVA is damaged using Jasper Reports

ireportjasper-reportsjavapdf

I am using iReport Designer 4.7 to create .jrxml. Its a very simle .jrxml which displays parameters passsed
from JAVA. The test pdf gets generated from iReport Designer and I can view it using Adobe Reader.

Now, Here is the java code

I am calling createReport(String reportName, Map params) from Servlet.
The parameters are set from Servlet. There will be always parameters passed.

public void generateReport(String fileName, String outFileName, Map paramerterMap,
            String reportFormat) throws JRException{

    String reportSource = "C:\\jrxml\\" + fileName;
    String outFile = null;
    downloadPath = "C:\\pdfs\\";

    outFile = downloadPath + outFileName;
            JRExporter exporter = new JRPdfExporter();
            JasperPrint jasperPrint = JasperFillManager.fillReport(reportSource, paramerterMap);
        exporter.setParameter(JRXlsExporterParameter.CHARACTER_ENCODING,"UTF-8");
                    exporter.setParameter(JRExporterParameter.OUTPUT_FILE_NAME, outFile);
        exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);

                    exporter.exportReport();
}

public Boolean createReport(String reportName, Map params) {
    try {
        String jrFile = reportName + ".jasper";
        String outFileName = String.valueOf(7884);
        outFileName += "_" + reportName + ".pdf";
        generateReport(jrFile, outFileName, params, ".pdf");
        return true;
    }  catch (JRException e) {
        e.printStackTrace();
        log.error("ReportManager--generateReport--JRException: " + e);
                    return false;
    } catch (Exception e) {
        e.printStackTrace();
        log.error("ReportManager--generateReport--Exception: " + e);
        return false;
    }
}

I am using same set of .jar which iReport Designer used.
(In fact I have copied .jar files from iReport installation directory)

Problem: The pdf generated using JAVA code is broken.
When I try to open PDF at created location, The Adobe reader says :

Adobe Reader could not open 'test.pdf' because it is either not a
supported file type or because the file has been damaged (for example,
it was sent as an email attachment and wasn't correctly decoded).

enter image description here

EDIT: I do not get any exception and the generated file size is around 5 KB.

EDIT2: Adding JRXML

<?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="Certificate" pageWidth="595" pageHeight="842" whenNoDataType="AllSectionsNoDetail" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" uuid="7367a6fb-f8da-4ba3-b90d-319807f92789">
    <property name="ireport.zoom" value="1.0"/>
    <property name="ireport.x" value="0"/>
    <property name="ireport.y" value="0"/>
    <property name="ireport.scriptlethandling" value="0"/>
    <property name="ireport.encoding" value="UTF-8"/>
    <import value="net.sf.jasperreports.engine.*"/>
    <import value="java.util.*"/>
    <import value="net.sf.jasperreports.engine.data.*"/>
    <parameter name="name" class="java.lang.String"/>
    <background>
        <band splitType="Stretch"/>
    </background>
    <title>
        <band height="27" splitType="Stretch">
            <textField pattern="MMMMM dd, yyyy" isBlankWhenNull="false">
                <reportElement uuid="b72c0bad-3935-40ba-8d6d-3993cb5122d2" key="textField" x="413" y="0" width="140" height="20"/>
                <box>
                    <topPen lineWidth="0.0" lineStyle="Solid" lineColor="#000000"/>
                    <leftPen lineWidth="0.0" lineStyle="Solid" lineColor="#000000"/>
                    <bottomPen lineWidth="0.0" lineStyle="Solid" lineColor="#000000"/>
                    <rightPen lineWidth="0.0" lineStyle="Solid" lineColor="#000000"/>
                </box>
                <textElement>
                    <font size="12"/>
                </textElement>
                <textFieldExpression><![CDATA[new java.util.Date()]]></textFieldExpression>
            </textField>
        </band>
    </title>
    <pageHeader>
        <band height="21" splitType="Stretch"/>
    </pageHeader>
    <columnHeader>
        <band height="22" splitType="Stretch"/>
    </columnHeader>
    <detail>
        <band height="141" splitType="Stretch">
            <textField isStretchWithOverflow="true" isBlankWhenNull="true">
                <reportElement uuid="cbaae0d4-53da-420e-8efa-7f4fcc6900f0" key="name" x="0" y="10" width="530" height="20"/>
                <box>
                    <topPen lineWidth="0.0" lineStyle="Solid" lineColor="#000000"/>
                    <leftPen lineWidth="0.0" lineStyle="Solid" lineColor="#000000"/>
                    <bottomPen lineWidth="0.0" lineStyle="Solid" lineColor="#000000"/>
                    <rightPen lineWidth="0.0" lineStyle="Solid" lineColor="#000000"/>
                </box>
                <textElement textAlignment="Left" verticalAlignment="Middle">
                    <font fontName="Arial" size="11" isBold="true"/>
                </textElement>
                <textFieldExpression><![CDATA[$P{name}]]></textFieldExpression>
            </textField>

        </band>
    </detail>
    <columnFooter>
        <band splitType="Stretch"/>
    </columnFooter>
    <pageFooter>
        <band height="20" splitType="Stretch"/>
    </pageFooter>
    <summary>
        <band splitType="Stretch"/>
    </summary>
</jasperReport>

Best Answer

Hardik,

I see 2-3 things over here

1) Your outfile name in generateReport always comes as "c:\pdfs"+ NULL. ( I wonder why test.pdf is still created )

2) What does gujarati object contains parameters for reports??

EDIT

3) Just asking why keep two seperate function for report generation? In my opinion you could achieve the objective with single function createReport.!

EDIT : 2

I think this link might offer some help : http://jasperforge.org/uploads/publish/jasperreportswebsite/trunk/faq.html?group_id=252#FAQ29

Read all text from a file

Java 11 added the readString() method to read small files as a String, preserving line terminators:

String content = Files.readString(path, StandardCharsets.US_ASCII);

For versions between Java 7 and 11, here's a compact, robust idiom, wrapped up in a utility method:

static String readFile(String path, Charset encoding)
  throws IOException
{
  byte[] encoded = Files.readAllBytes(Paths.get(path));
  return new String(encoded, encoding);
}

Read lines of text from a file

Java 7 added a convenience method to read a file as lines of text, represented as a List<String>. This approach is "lossy" because the line separators are stripped from the end of each line.

List<String> lines = Files.readAllLines(Paths.get(path), encoding);

Java 8 added the Files.lines() method to produce a Stream<String>. Again, this method is lossy because line separators are stripped. If an IOException is encountered while reading the file, it is wrapped in an UncheckedIOException, since Stream doesn't accept lambdas that throw checked exceptions.

try (Stream<String> lines = Files.lines(path, encoding)) {
  lines.forEach(System.out::println);
}

This Stream does need a close() call; this is poorly documented on the API, and I suspect many people don't even notice Stream has a close() method. Be sure to use an ARM-block as shown.

If you are working with a source other than a file, you can use the lines() method in BufferedReader instead.

Memory utilization

The first method, that preserves line breaks, can temporarily require memory several times the size of the file, because for a short time the raw file contents (a byte array), and the decoded characters (each of which is 16 bits even if encoded as 8 bits in the file) reside in memory at once. It is safest to apply to files that you know to be small relative to the available memory.

The second method, reading lines, is usually more memory efficient, because the input byte buffer for decoding doesn't need to contain the entire file. However, it's still not suitable for files that are very large relative to available memory.

For reading large files, you need a different design for your program, one that reads a chunk of text from a stream, processes it, and then moves on to the next, reusing the same fixed-sized memory block. Here, "large" depends on the computer specs. Nowadays, this threshold might be many gigabytes of RAM. The third method, using a Stream<String> is one way to do this, if your input "records" happen to be individual lines. (Using the readLine() method of BufferedReader is the procedural equivalent to this approach.)

Character encoding

One thing that is missing from the sample in the original post is the character encoding. There are some special cases where the platform default is what you want, but they are rare, and you should be able justify your choice.

The StandardCharsets class defines some constants for the encodings required of all Java runtimes:

String content = readFile("test.txt", StandardCharsets.UTF_8);

The platform default is available from the Charset class itself:

String content = readFile("test.txt", Charset.defaultCharset());

Note: This answer largely replaces my Java 6 version. The utility of Java 7 safely simplifies the code, and the old answer, which used a mapped byte buffer, prevented the file that was read from being deleted until the mapped buffer was garbage collected. You can view the old version via the "edited" link on this answer.

Best Answer

Related Solutions

Java – How to call one constructor from another in Java

Java – How to create a Java string from the contents of a file

Read all text from a file

Read lines of text from a file

Memory utilization

Character encoding

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