Java-spring错误: Actual and formal argument differ in length

Question

我收到以下错误:

Error:constructor Commonctx in class CommonCtx cant be applied to given types; required: org.springframework.core.env.Environment found:no arguments reason: actual and formal argument lists differ in length.

正在使用的代码:

@Component
@PropertySource("file:${input.file.loc}")
public class CommonCtx implements IContext {

    private String tempDir;

    @Autowired
    public CommonCtx(Environment inputProperties) {

        tempDir = inputProperties.getProperty("temp.dir");
...
}

@Component
@Conditional(cond1.class)
@PropertySource("file:${input.file.loc}")
public class NewCCtx extends CommonCtx implements NewCContext{

    private String productName;

    /**
     * @param inputProperties
     */
    @Autowired
    public NewCCtx(Environment inputProperties) {
        this.productName = inputProperties.getProperty("product.name");
    }

Answer 1

在此构造函数中:

public NewCCtx(Environment inputProperties) {
    this.productName = inputProperties.getProperty("product.name");
}

您应该使用正确的参数显式调用 super 构造函数 (CommonCtx):

public NewCCtx(Environment inputProperties) {
    super(inputProperties);
    this.productName = inputProperties.getProperty("product.name");
}

这是必需的，因为您的父类没有零参数构造函数。