Java 错误：找不到或加载主类

Z时代
2024-01-10
分类：问答

我在编译和运行Java代码时遇到麻烦，目的是允许我将Java与模拟建模包Vensim的共享对象接口。

以下代码编译没有错误：

javac -d . -cp ./apache-log4j-1.2.16/log4j-1.2.16.jar:./vensim.jar SpatialModel.java VensimHelper.java VensimException.java VensimContextRepository.java

但是，当我尝试运行以下命令时：

java -cp ./apache-log4j-1.2.16/log4j-1.2.16.jar:./vensim.jar SpatialModel vars

我收到以下错误：“错误：找不到或加载主类SpatialModel”。我的SpatialModel.java代码确实包含一个“主要”方法（如下），所以我不确定是什么问题-有人可以帮我吗？谢谢。

import java.io.File;
import java.text.NumberFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.apache.log4j.Logger;
public class SpatialModel {
    private VensimHelper vh;
    public static final String DLL_LIBNAME_PARAM = "vensim_lib_nam";
    public static final String MODEL_PATH_PARAM = "vensim_model_path";
    private final static int VENSIM_CONTEXT_CREATION_MAX_FAILURE_COUNT = 10;
    public SpatialModel() throws SpatialException {
        String libName = System.getProperty(DLL_LIBNAME_PARAM);
        String modelPath = System.getProperty(MODEL_PATH_PARAM);        
        if(libName == null || libName.trim().equals("")) {
            log.error("Vensim library name has to be set with -D" + DLL_LIBNAME_PARAM);
            throw new SpatialException("Vensim library name has to be set with -D" + DLL_LIBNAME_PARAM);
        }
        if(modelPath == null || modelPath.trim().equals("")) {
            log.error("Model path has to set with -D" + MODEL_PATH_PARAM);
            throw new SpatialException("Model path ahs to be set with -D" + MODEL_PATH_PARAM);
        }
        for (int i = 0; i < VENSIM_CONTEXT_CREATION_MAX_FAILURE_COUNT && vh == null; i++) {
            try {
                log.info("creating new vensim helper\n\tdll lib: " + libName + "\n\tmodel path: " + modelPath);
                vh = new VensimHelper(libName, modelPath);
            } catch (Throwable e) {
                log.error("An exception was thrown when initializing Vensim, try: " + i, e);
            }
        }
        if (vh == null) {
            throw new SpatialException("Can't initialize Vensim");
        }
    }
    public static void main(String[] args) throws VensimException {
        long before = System.currentTimeMillis();   
        String libName = System.getProperty(DLL_LIBNAME_PARAM);
        String modelPath = System.getProperty(MODEL_PATH_PARAM);
        if (libName == null) {
            libName = "libvensim";
        }
        if(modelPath == null) {
            modelPath = "~/BassModel.vmf";
        }
        System.setProperty(DLL_LIBNAME_PARAM, libName);
        System.setProperty(MODEL_PATH_PARAM, modelPath);
        if (args.length > 0 && args[0].equals("info")) {
            System.out.println(new VensimHelper(libName, modelPath).getVensimInfo());
        } else if (args.length > 0 && args[0].equals("vars")) {
            VensimHelper helper = new VensimHelper(libName, modelPath);
            String[] vars = helper.getVariables();
            for (String var : vars) {
                System.out.println(helper.getVariableInfo(var));
            }
        } else {
            File f = new File(".");
            System.out.println(f.getAbsolutePath());
            SpatialModel sm = new SpatialModel();
        }
        System.out.println("Execution time: " + (System.currentTimeMillis() - before));
    }
}