tess4j 是一个自带库的OCR，我做了一个maven项目来测试它，我确实在eclipse中添加了maven的安装路径。我添加了 M2_HOME、MAVEN_HOME 和 JAVA_HOME 环境变量，
这是我的父母 pom
<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/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>fr.mssb.ongoing</groupId>
<artifactId>ongoing-parent</artifactId>
<packaging>pom</packaging>
<version>1.0</version>
<name>ongoing</name>
<modules>
<module>capcha-solver</module>
</modules>
<build>
<pluginManagement>
<plugins>
<!-- All project will be interpreted (source) and compiled (target) in java 7 -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>
<!-- this will make eclipse:eclipse goal work and make the project Eclipse compatible -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-eclipse-plugin</artifactId>
<version>2.5.1</version>
<configuration>
<downloadSources>true</downloadSources>
<downloadJavadocs>true</downloadJavadocs>
<classpathContainers>
<classpathContainer>org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.7</classpathContainer>
</classpathContainers>
<additionalBuildcommands>
<buildcommand>net.sf.eclipsecs.core.CheckstyleBuilder</buildcommand>
</additionalBuildcommands>
<additionalProjectnatures>
<projectnature>net.sf.eclipsecs.core.CheckstyleNature</projectnature>
</additionalProjectnatures>
</configuration>
</plugin>
</plugins>
</pluginManagement>
</build>
<!-- All child pom will inherit those dependancies -->
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
</dependencies>
</project>
这是我的孩子 pom
<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/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>fr.mssb.ongoing</groupId>
<artifactId>ongoing-parent</artifactId>
<version>1.0</version>
</parent>
<groupId>fr.mssb.ongoing</groupId>
<artifactId>capcha-solver</artifactId>
<version>1.0</version>
<packaging>jar</packaging> <!-- I think this is useless -->
<name>A capcha solver based on terassec ocr</name>
<build>
<plugins>
<!-- autorun unit tests during maven compilation -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<configuration>
<argLine>-Xmx1024m -XX:MaxPermSize=256m -XX:-UseSplitVerifier</argLine>
<skipTests>-DskipTests</skipTests>
</configuration>
</plugin>
<!-- this should make the tesseract ocr native dll work without doing anything -->
<plugin>
<groupId>com.googlecode.mavennatives</groupId>
<artifactId>maven-nativedependencies-plugin</artifactId>
<version>0.0.7</version>
<executions>
<execution>
<id>unpacknatives</id>
<goals>
<goal>copy</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
<dependencies>
<!--
Log4j 2 is broken up in an API and an implementation (core), where the API
provides the interface that applications should code to. Strictly speaking
Log4j core is only needed at runtime and not at compile time.
However, below we list Log4j core as a compile time dependency to improve
the startup time for custom plugins.
-->
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-api</artifactId>
<version>2.1</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
<version>2.1</version>
</dependency>
<!--
Integration of tesseract OCR
-->
<dependency>
<groupId>net.sourceforge.tess4j</groupId>
<artifactId>tess4j</artifactId>
<version>1.4.1</version>
</dependency>
</dependencies>
</project>
当然，代码（取自 tess4j 示例）
package test;
import java.io.File;
import net.sourceforge.tess4j.Tesseract;
import net.sourceforge.tess4j.TesseractException;
/**
* Classe d'exemple.
*/
public class TesseractExample {
public static void main(String[] args) {
File imageFile = new File("C:\\DEV\\repo\\ongoing\\capcha-solver\\src\\test\\resources\\random.jpg");
Tesseract instance = Tesseract.getInstance(); // JNA Interface Mapping
// Tesseract1 instance = new Tesseract1(); // JNA Direct Mapping
try {
String result = instance.doOCR(imageFile);
System.out.println(result);
} catch (TesseractException e) {
System.err.println(e.getMessage());
}
}
}
当我启动它时，我得到了这个例外
Exception in thread "main" java.lang.NoSuchFieldError: RESOURCE_PREFIX
at net.sourceforge.tess4j.util.LoadLibs.<clinit>(LoadLibs.java:60)
at net.sourceforge.tess4j.TessAPI.<clinit>(TessAPI.java:40)
at net.sourceforge.tess4j.Tesseract.init(Tesseract.java:303)
at net.sourceforge.tess4j.Tesseract.doOCR(Tesseract.java:239)
at net.sourceforge.tess4j.Tesseract.doOCR(Tesseract.java:188)
at net.sourceforge.tess4j.Tesseract.doOCR(Tesseract.java:172)
at test.TesseractExample.main(TesseractExample.java:19)
我不知道这是否与 tess4j 相关或 JNA/JNI 问题，如您所见，我有一个“应该”（以前从未使用过 DLL）使它们工作的插件。
同样在父pom中，我的插件位于插件管理标签之间，我想我应该将它们放在构建标签之间，不是吗？
任何想法？
谢谢。