情况:我更新了我的IDE (Eclipse 2020-6到2020-9),对我的web服务的请求因以下错误停止工作:
sep. 19, 2020 7:09:23 A. M. io.vertx.core.impl.ContextImpl
SEVERE: Unhandled exception
java.lang.NullPointerException
at model.Concepto.<init>(Concepto.java:23)
at consumer.ConceptoAccess.lambda$getConceptos$0(ConceptoAccess.java:31)
at java.base/java.lang.Iterable.forEach(Iterable.java:75)
at consumer.ConceptoAccess.lambda$getConceptos$1(ConceptoAccess.java:28)
at io.vertx.ext.web.client.impl.HttpContext.handleDispatchResponse(HttpContext.java:313)
at io.vertx.ext.web.client.impl.HttpContext.execute(HttpContext.java:300)
at io.vertx.ext.web.client.impl.HttpContext.next(HttpContext.java:275)
at io.vertx.ext.web.client.impl.predicate.PredicateInterceptor.handle(PredicateInterceptor.java:69)
at io.vertx.ext.web.client.impl.predicate.PredicateInterceptor.handle(PredicateInterceptor.java:32)这是我的第23行在Concepto.java中的包“模型”:
package model;
import javafx.beans.property.IntegerProperty;
import javafx.beans.property.SimpleStringProperty;
import javafx.beans.property.StringProperty;
public class Concepto {
private IntegerProperty idconcepto;
private StringProperty descripcion;
public Concepto() {
// idconcepto = new SimpleIntegerProperty();
descripcion = new SimpleStringProperty();
}
public Concepto(Integer idconcepto, String descripcion) {
// this.idconcepto.set(idconcepto);
this.descripcion.set(descripcion);
}
public Concepto(String descripcion) {
this.descripcion.set(descripcion); //<----- Line 23
}
public StringProperty getDescripcion() {
return descripcion;
}
public void setDescripcion(String descripcion) {
this.descripcion.set(descripcion);
}
public IntegerProperty getIdconcepto() {
return idconcepto;
}
}这是“”包中ConceptoAccess.java中的第31行:
public class ConceptoAccess {
private static final String HOST = "192.168.0.15";
private static final int PORT = 8091;
public static void getConceptos(ObservableList<Concepto> conceptoData) {
WebClient client = WebClient.create(Vertx.vertx());
client
.get(PORT, HOST, "/api/conceptos")
.send(ar -> {
if (ar.succeeded()) {
conceptoData.clear();
HttpResponse<Buffer> response = ar.result();
response.bodyAsJsonArray().forEach(concepto -> {
JsonObject jo = (JsonObject) concepto;
conceptoData.add(new Concepto(jo.getString("descripcion"))); <---Line 31
});
System.out.println("Received response with status code " + response.statusCode());
System.out.println(response.bodyAsJsonArray());
} else {
System.out.println("Something went wrong " + ar.cause().getMessage());
}
});
}我测试了web服务并运行良好:用邮差测试
怎么了?在Eclipse更新之前,一切正常。我使用openJDK 11 + JavaFX 14 +Vert.x3.9.3
蒂娅需要任何帮助!
发布于 2020-09-19 11:53:13
或者把它移到
private final StringProperty descripcion = new SimpleStringProperty();让它最终结束。删除此初始化器的所有其他出现。
发布于 2020-09-19 11:17:50
您得到一个NullPointerException,因为您试图访问this.description.set,但是this.description是空的。您只在默认构造函数中为描述符提供一个值(参数为零),并在其他构造函数中将其保留为null。
private StringProperty descripcion;
public Concepto() {
descripcion = new SimpleStringProperty();
}
public Concepto(Integer idconcepto, String descripcion) {
descripcion = new SimpleStringProperty(); // add this
this.descripcion.set(descripcion);
}
public Concepto(String descripcion) {
descripcion = new SimpleStringProperty(); // add this
this.descripcion.set(descripcion);
}https://stackoverflow.com/questions/63967792
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