Question

我正在尝试编写一个OSMOSIS扩展程序，它使用GeoTools并读取GeoTiff图像。

我已经写了一个最简单的工作示例：

package that.is.my.test;

import java.io.File;
import java.io.IOException;
import org.geotools.coverage.grid.GridCoverage2D;
import org.geotools.gce.geotiff.GeoTiffReader;
import org.geotools.geometry.Envelope2D;
import org.opengis.coverage.grid.GridEnvelope;

public class ExampleClass {
    public static void main(String[] args) {
        new ExampleClass();
    }

    public ExampleClass() {
        try {
            File file = new File("<GEOTIFFFILE>");
            GeoTiffReader reader = new GeoTiffReader(file);
            GridCoverage2D coverage = (GridCoverage2D) reader.read(null);
            GridEnvelope gridBounds = coverage.getGridGeometry().getGridRange();
            System.out.println("grid bounds: " + gridBounds);

            Envelope2D worldBounds = coverage.getEnvelope2D();
            System.out.println("world bounds: " + worldBounds);

            int numBands = coverage.getNumSampleDimensions();
            System.out.println("num bands: " + numBands);

            System.out.println("Goodbye.");
        } catch (IllegalArgumentException | IOException e) {
            e.printStackTrace();
        }
    }
}

注意：这是一个最小的示例类，但OSMOSIS插件中的代码还没有做任何其他事情。

我可以从NetBeans运行这个示例类，它工作正常。我可以将它打包成一个可运行的jar，这也可以。

OSMOSIS插件无法从NetBeans运行，因为它将被编译到jar中，然后由OSMOSIS本身调用。但是当我这样做时，以GridCoverage2D开头的行给了IllegalArgumentException一条消息ImageRead: No OperationDescriptor is registered in the current operation registry under this name.。

当我让这两个类打印出一个完整的JAI注册表列表时，我可以看到在OSMOSIS案例中，ImageRead，ImageWrite和其他几个版本都丢失了。

我根本不明白这是怎么发生的！当我查看罐子时，文件META-INF\services\javax.imageio.spi.ImageReaderSpi存在于两个文件中，内容完全相同。

这是我的插件中的POM.xml，Example类具有相同的依赖关系以及repos和build指令：

<?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>
    <groupId>hello.OSMOSIS</groupId>
    <artifactId>my-osmosis-plugin</artifactId>
    <version>1.0-SNAPSHOT${jarWarning}</version>
    <packaging>jar</packaging>
    <name>OSMOSIS TEST plugin</name>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.7</maven.compiler.source>
        <maven.compiler.target>1.7</maven.compiler.target>
        <osmosisScope>provided</osmosisScope> <!-- configure this by using the profiles, this is fallback only. -->
        <geotools.version>12-RC1</geotools.version>
    </properties>
    <!-- We define two different profiles: 
        debugWithNetbeans includes all the OSMOSIS jars into the plugin, 
            so that we can test-run the plugin with Netbeans (or anything else). 
            Note: This does not work yet...
        pluginProductions doesn't include the OSMOSIS sources, because later on 
            the plugin will be called BY osmosis and will not need the jars anymore. 
    DO NOT FORGET to set this correctly :-) -->
    <profiles>
        <profile>
            <id>debugWithNetbeans</id>
            <properties>
                <osmosisScope>compile</osmosisScope>
                <jarWarning>-DEBUG-BUILD</jarWarning>
            </properties>
        </profile>
        <profile>
            <id>pluginProduction</id>
            <properties>
                <osmosisScope>provided</osmosisScope>
                <jarWarning></jarWarning>
            </properties>
        </profile>
    </profiles>
    <repositories>
        <repository>
            <id>osgeo</id>
            <name>Open Source Geospatial Foundation Repository</name>
            <url>http://download.osgeo.org/webdav/geotools/</url>
        </repository>
    </repositories>
    <dependencies>
        <dependency>
            <groupId>org.openstreetmap.osmosis</groupId>
            <artifactId>osmosis-core</artifactId>
            <version>0.43-RELEASE</version>
            <scope>${osmosisScope}</scope>
        </dependency>
        <dependency>
            <groupId>org.openstreetmap.osmosis</groupId>
            <artifactId>osmosis-xml</artifactId>
            <version>0.43.1</version>
            <scope>${osmosisScope}</scope>
        </dependency>
        <dependency>
            <groupId>org.geotools</groupId>
            <artifactId>gt-geotiff</artifactId>
            <version>${geotools.version}</version>
        </dependency>
        <dependency>
            <groupId>org.geotools</groupId>
            <artifactId>gt-epsg-hsql</artifactId>
            <version>${geotools.version}</version>                 
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-shade-plugin</artifactId>
                <version>1.3.1</version>
                <executions>
                    <execution>
                        <phase>package</phase>
                        <goals>
                            <goal>shade</goal>
                        </goals>
                        <configuration>
                            <transformers>
                                <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                                    <manifestEntries>
                                        <Main-Class>hello.OSMOSIS.DoNothingBecauseImAPluginOnly</Main-Class>
                                        <Implementation-Vendor>Blapfi</Implementation-Vendor>
                                        <Implementation-Vendor-Id>huiuiui</Implementation-Vendor-Id>
                                        <Implementation-Version>bapfi</Implementation-Version>
                                    </manifestEntries>
                                </transformer>
                                <transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer" />
                            </transformers>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>

也许有人可以给我一些关于我做错的提示？会非常棒的。： - ）

Answer 1

我现在可能已经找到了解释：当JAI jar（或包含它的jar）被添加到类路径时，JAI注册表似乎被初始化了。可悲的是，OSMOSIS中的罐子＆＃39; plugins目录永远不会添加到任何类路径，但由OSMOSIS本身读取。

所以，我的解决方案是将插件构建为jar，与包含所有依赖项的lib文件夹捆绑在一起，并指示用户README添加/plugins/lib/* OSMOSIS的类路径。

在osmosis.bat中，可以将-cp "%PLEXUS_CP%"更改为-cp "%PLEXUS_CP%";plugins/lib/*来完成此操作。在Linux版本中，您必须使用:代替;，我认为（https://stackoverflow.com/a/219801/4249849）。

Edit1：仅当您的当前工作目录为osmosis/bin时才有效。如果要从任何地方（路径）使用它，则必须添加pushd和popd命令（Windows）。

JAI ImageRead模块迷路了

1 个答案: