Adobe AEM与IText PDF 7.1.x，java.lang.NoClassDefFoundError：orgslf4jLoggerFactory。

Question

我使用的是 IText PDF(7.1.x) 在 AEM 6.5. 我已经将IText7作为AEM主项目中的一个子项目添加到AEM中。代码构建成功，但我得到的是以下信息

java.lang.NoClassDefFoundError: org/slf4j/LoggerFactory
    at com.itextpdf.io.font.FontRegisterProvider.<clinit>(FontRegisterProvider.java:68)
    at com.itextpdf.io.font.FontProgramFactory.<clinit>(FontProgramFactory.java:67)
    at com.itextpdf.kernel.font.PdfFontFactory.createFont(PdfFontFactory.java:234)
    at com.itextpdf.kernel.font.PdfFontFactory.createFont(PdfFontFactory.java:220)
    at com.itextpdf.kernel.font.PdfFontFactory.createFont(PdfFontFactory.java:162)
    at com.itextpdf.kernel.font.PdfFontFactory.createFont(PdfFontFactory.java:93)
    at com.itextpdf.layout.RootElement.getDefaultProperty(RootElement.java:178)
    at com.itextpdf.layout.Document.getDefaultProperty(Document.java:342)
    ............
Caused by: java.lang.ClassNotFoundException: org.slf4j.LoggerFactory not found by com.pdfgen 

请在下面找到该子项目的POM文件。

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>com.pdfgen.itexttest</groupId>
        <artifactId>pdfgen_itexttest</artifactId>
        <version>1.0.0-SNAPSHOT</version>
        <relativePath>../pom.xml</relativePath>
    </parent>
    <artifactId>pdfgen_itexttest.itext</artifactId>
    <packaging>jar</packaging>

    <name>Pdfgen IText POC</name>
    <description>IText bundle for POC/description>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-dependency-plugin</artifactId>
                <executions>
                    <execution>
                        <id>copy-dependencies</id>
                        <goals>
                            <goal>copy-dependencies</goal>
                        </goals>
                        <configuration>
                            <includeArtifactIds>kernel,layout,bcprov-jdk15on,slf4j-api,slf4j-simple</includeArtifactIds>
                            <stripVersion>true</stripVersion>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
            <plugin>
                <groupId>biz.aQute.bnd</groupId>
                <artifactId>bnd-maven-plugin</artifactId>
                <executions>
                    <execution>
                        <id>bnd-process</id>
                        <goals>
                            <goal>bnd-process</goal>
                        </goals>
                        <configuration>
                            <bnd><![CDATA[
Bundle-Category: ITextHtml2pdf
Bundle-SymbolicName: com.pdfgen
Import-Package: javax.annotation;version=0.0.0,
                !sun.*,
                org.slf4j,
                org.bouncycastle.asn1,
                *
Include-Resource: target/dependency/slf4j-api.jar,
                  target/dependency/slf4j-simple.jar
Bundle-ClassPath: .,slf4j-api
Export-Package: com.itextpdf.*
          ]]></bnd>
                        </configuration>
                    </execution>
                </executions>
                <dependencies>
                    <dependency>
                        <groupId>org.apache.sling</groupId>
                        <artifactId>org.apache.sling.caconfig.bnd-plugin</artifactId>
                        <version>1.0.2</version>
                    </dependency>
                </dependencies>
            </plugin>
            <plugin>
                <groupId>biz.aQute.bnd</groupId>
                <artifactId>bnd-baseline-maven-plugin</artifactId>
                <configuration>
                    <failOnMissing>false</failOnMissing>
                </configuration>
                <executions>
                    <execution>
                        <id>baseline</id>
                        <goals>
                            <goal>baseline</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-surefire-plugin</artifactId>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-jar-plugin</artifactId>
                <configuration>
                    <archive>
                        <manifestFile>${project.build.outputDirectory}/META-INF/MANIFEST.MF</manifestFile>
                    </archive>
                </configuration>
            </plugin>
        </plugins>
    </build>
    <dependencies>
        <dependency>
            <groupId>com.itextpdf</groupId>
            <artifactId>kernel</artifactId>
        </dependency>
        <dependency>
            <groupId>com.itextpdf</groupId>
            <artifactId>layout</artifactId>
        </dependency>
        <dependency>
            <groupId>org.bouncycastle</groupId>
            <artifactId>bcprov-jdk15on</artifactId>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-simple</artifactId>
        </dependency>
        <dependency>
            <groupId>com.itextpdf</groupId>
            <artifactId>io</artifactId>
        </dependency>
    </dependencies>
</project>

我尝试了一段PDF生成代码，它在AEM之外完美地工作，但在AEM中我得到了上述错误。

Answer 1

slf4j-api包在AEM上是可用的--没有必要导入它。事实上，你自己导入它可能是你的问题的原因。请在不导入它的情况下再试一次--并确保你的依赖定义中的slf4j版本与你的AEM安装相匹配。

除此之外，我建议你改用maven插件，比如efilevault-package-maven-plugin来嵌入外部依赖。