创建在 com.example.betterreadsDataloader.BetterreadsDataloader.BetterreadsDataloader1Application 中定义名称为

Question

我正在用Cassandra创建这个春季启动，当试图与Cassandra连接时，我得到了这个错误。请帮助:

org.springframework.beans.factory.BeanCreationException: Error creating bean 
with name 'sessionBuilderCustomizer' defined in 
com.example.betterreadsDataloader.BetterreadsDataloader1Application: 
Bean instantiation via factory method failed; 
nested exception is org.springframework.beans.BeanInstantiationException: 
Failed to instantiate [org.springframework.boot.autoconfigure.cassandra.CqlSessionBuilderCustomizer]: 
Factory method 'sessionBuilderCustomizer' threw exception; 
nested exception is java.lang.NullPointerException
at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:658) ~[spring-beans-5.3.20.jar:5.3.20]
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:638) ~[spring-beans-5.3.20.jar:5.3.20]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1352) ~[spring-beans-5.3.20.jar:5.3.20]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1195) ~[spring-beans-5.3.20.jar:5.3.20]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:582) ~[spring-beans-5.3.20.jar:5.3.20]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542) ~[spring-beans-5.3.20.jar:5.3.20]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.20.jar:5.3.20]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.20.jar:5.3.20]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.20.jar:5.3.20]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.20.jar:5.3.20]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:953) ~[spring-beans-5.3.20.jar:5.3.20]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:918) ~[spring-context-5.3.20.jar:5.3.20]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:583) ~[spring-context-5.3.20.jar:5.3.20]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:734) ~[spring-boot-2.7.0.jar:2.7.0]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:408) ~[spring-boot-2.7.0.jar:2.7.0]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:308) ~[spring-boot-2.7.0.jar:2.7.0]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1306) ~[spring-boot-2.7.0.jar:2.7.0]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1295) ~[spring-boot-2.7.0.jar:2.7.0]
at com.example.betterreadsDataloader.BetterreadsDataloader1Application.main(BetterreadsDataloader1Application.java:20) ~[classes/:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:566) ~[na:na]
at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) ~[spring-boot-devtools-2.7.0.jar:2.7.0]

package com.example.betterreadsDataloader;
import java.nio.file.Path;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.cassandra.CqlSessionBuilderCustomizer;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import com.example.betterreadsDataloader.connection.DataStaxAstraProperties;

@SpringBootApplication
@EnableConfigurationProperties(DataStaxAstraProperties.class)
public class BetterreadsDataloader1Application {
public static void main(String[] args) {
SpringApplication.run(BetterreadsDataloader1Application.class, args);
}
@Bean
public CqlSessionBuilderCustomizer sessionBuilderCustomizer(DataStaxAstraProperties astraProperties) {
Path bundle = astraProperties.getSecureConnectBundle().toPath();
return builder -> builder.withCloudSecureConnectBundle(bundle);
}

}

package com.example.betterreadsDataloader.connection;
import java.io.File;
import org.springframework.boot.context.properties.ConfigurationProperties;

@ConfigurationProperties(prefix="datastax.astra")
public class DataStaxAstraProperties {
private File secureConnectBundle;
public File getSecureConnectBundle() {
return secureConnectBundle;
}
public void setSecureConnectBundle(File secureConnectBundle) {
this.secureConnectBundle = secureConnectBundle;
}
}

application.yml

spring:
data:
cassandra:
keyspace-name: xxx
username: xxx
password: xxxx
schema-action: create-if-not-exists
request:
timeout:10s
connection:
connect-timeout:10s
init-query-timeout:10s


datastax.astra:
secure-connect-bundle:secure-connect-booktracker.zip

astra.db:
id:xxx
region:xxx
namespace:main
application.token:xxx

Answer 1

看起来你在做Java Brains的BetterReads编码系列。

来自sessionBuilderCustomizer的NullPointerException可能意味着它无法定位您的安全连接包(SCB)。根据Koushik的workshop，你需要将SCB放在项目的src/main/resources/目录下。

检查你已经根据研讨会正确配置了你的项目，然后尝试再次运行应用程序。干杯!

Answer 2

在我看来，您的应用程序中出现了缩进错误。其中属性astra.db应该是spring.astra.db而不是astra.db作为一个独立的属性。

以及类DataStaxAstraProperties应该用@Configuration注释。

也就是说你的应用程序。Yml应该看起来像这样

spring:
data:
cassandra:
keyspace-name: xxx
username: xxx
password: xxxx
schema-action: create-if-not-exists
request:
timeout: 10s
connection:
connect-timeout: 10s
init-query-timeout: 10s
datastax.astra:
secure-connect-bundle:secure-connect-booktracker.zip
astra.db:
id: xxx
region: xxx
namespace: main
application.token:xxx