Java Eclipse Maven项目运行时ClassNotFoundException
我想尝试使用GeoTools进行CRS转换。我在Eclipse中创建了一个新的Maven项目,并设置了依赖项。Java Eclipse Maven项目运行时ClassNotFoundException,java,eclipse,maven,geotools,Java,Eclipse,Maven,Geotools,我想尝试使用GeoTools进行CRS转换。我在Eclipse中创建了一个新的Maven项目,并设置了依赖项。pom.xml文件包含以下内容: <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.apa
pom.xml
文件包含以下内容:
<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>
<groupId>org.geotools</groupId>
<artifactId>geotools-homolosine</artifactId>
<version>0.0.1-SNAPSHOT</version>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<geotools.version>21-SNAPSHOT</geotools.version>
</properties>
<dependencies>
<dependency>
<groupId>org.geotools</groupId>
<artifactId>gt-referencing</artifactId>
<version>${geotools.version}</version>
</dependency>
<dependency>
<groupId>org.geotools</groupId>
<artifactId>gt-epsg-hsql</artifactId>
<version>${geotools.version}</version>
</dependency>
<dependency>
<groupId>org.geotools</groupId>
<artifactId>gt-epsg-extension</artifactId>
<version>${geotools.version}</version>
</dependency>
</dependencies>
<repositories>
<repository>
<id>maven2-repository.dev.java.net</id>
<name>Java.net repository</name>
<url>http://download.java.net/maven/2</url>
</repository>
<repository>
<id>osgeo</id>
<name>Open Source Geospatial Foundation Repository</name>
<url>http://download.osgeo.org/webdav/geotools/</url>
</repository>
<repository>
<snapshots>
<enabled>true</enabled>
</snapshots>
<id>boundless</id>
<name>Boundless Maven Repository</name>
<url>http://repo.boundlessgeo.com/main</url>
</repository>
</repositories>
</project>
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.NoClassDefFoundError: org/opengis/referencing/crs/CoordinateReferenceSystem
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
at java.lang.Class.privateGetMethodRecursive(Class.java:3048)
at java.lang.Class.getMethod0(Class.java:3018)
at java.lang.Class.getMethod(Class.java:1784)
at sun.launcher.LauncherHelper.validateMainClass(LauncherHelper.java:544)
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:526)
Caused by: java.lang.ClassNotFoundException: org.opengis.referencing.crs.CoordinateReferenceSystem
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 7 more
Java编辑器不报告任何错误或警告。但是,当我运行程序(右键单击>运行方式>Java应用程序)时,控制台显示以下内容:
<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>
<groupId>org.geotools</groupId>
<artifactId>geotools-homolosine</artifactId>
<version>0.0.1-SNAPSHOT</version>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<geotools.version>21-SNAPSHOT</geotools.version>
</properties>
<dependencies>
<dependency>
<groupId>org.geotools</groupId>
<artifactId>gt-referencing</artifactId>
<version>${geotools.version}</version>
</dependency>
<dependency>
<groupId>org.geotools</groupId>
<artifactId>gt-epsg-hsql</artifactId>
<version>${geotools.version}</version>
</dependency>
<dependency>
<groupId>org.geotools</groupId>
<artifactId>gt-epsg-extension</artifactId>
<version>${geotools.version}</version>
</dependency>
</dependencies>
<repositories>
<repository>
<id>maven2-repository.dev.java.net</id>
<name>Java.net repository</name>
<url>http://download.java.net/maven/2</url>
</repository>
<repository>
<id>osgeo</id>
<name>Open Source Geospatial Foundation Repository</name>
<url>http://download.osgeo.org/webdav/geotools/</url>
</repository>
<repository>
<snapshots>
<enabled>true</enabled>
</snapshots>
<id>boundless</id>
<name>Boundless Maven Repository</name>
<url>http://repo.boundlessgeo.com/main</url>
</repository>
</repositories>
</project>
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.NoClassDefFoundError: org/opengis/referencing/crs/CoordinateReferenceSystem
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
at java.lang.Class.privateGetMethodRecursive(Class.java:3048)
at java.lang.Class.getMethod0(Class.java:3018)
at java.lang.Class.getMethod(Class.java:1784)
at sun.launcher.LauncherHelper.validateMainClass(LauncherHelper.java:544)
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:526)
Caused by: java.lang.ClassNotFoundException: org.opengis.referencing.crs.CoordinateReferenceSystem
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 7 more
不知何故,Maven依赖项在运行时是不可访问的。有什么不对劲吗?我使用您的代码创建了一个测试maven项目,然后将其导入eclipse,当您将
3035
更改为EPSG:3035
时,一切正常
在执行maven项目刷新时,我会检查您是否处于脱机模式,以确保JAR已下载。此错误是由于
pom.xml
文件中缺少build
部分造成的。除其他外,本节确定了项目的主要类别。显然,没有这些信息,Eclipse无法正确启动项目。以下是与上述项目相匹配的构建
部分:
<build>
<plugins>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.1.1</version>
<executions>
<execution>
<phase>test</phase>
<goals>
<goal>java</goal>
</goals>
<configuration>
<mainClass>org.ldesousa.Transformation</mainClass>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
org.codehaus.mojo
execmaven插件
1.1.1
测试
JAVA
org.ldesousa.Transformation
请注意,我必须将main包含到一个包中(
org.ldesousa
)库被正确下载到.m2
文件夹中,我怀疑这是Eclipse本身(或我使用它的方式)的问题。您说您在Eclipse外部创建了项目,然后导入了它,而我在Eclipse中创建了所有内容。您是如何创建该项目的?我使用了mvn-B原型:generate \-DarchetypeGroupId=org.apache.maven.archetypes \-DgroupId=com.ianturton-DartifactId=transform正如您所建议的,我直接使用maven在Eclipse外部创建了该项目。然后将其导入Eclipse并尝试运行:与以前的错误相同。