java.lang.NullPointerException 在 java.base/sun.nio.fs.UnixPath.normalizeAndCheck(UnixPath.java:75) 在 SpringApplication

Question

我在分支 npe 的 github 有 spring-data-aerospike 项目。

aerospike.host=localhost
aerospike.port=3000
aerospike.namespace=test
aerospike.timeout=125
os.name=Linux
line.separator=\n

springApplicationContext是

mport com.aerospike.demo.simplespringbootaerospikedemo.repositories.AerospikeUserRepository;
import com.aerospike.client.Host;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.aerospike.config.AbstractAerospikeDataConfiguration;
import org.springframework.data.aerospike.repository.config.EnableAerospikeRepositories;
import java.util.Collection;
import java.util.Collections;

@Configuration
@EnableConfigurationProperties(AerospikeConfigurationProperties.class)
@EnableAerospikeRepositories(basePackageClasses = AerospikeUserRepository.class)
public class AerospikeConfiguration extends AbstractAerospikeDataConfiguration {
  @Autowired
  private AerospikeConfigurationProperties aerospikeConfigurationProperties;
  @Override
  protected Collection<Host> getHosts() {
    return Collections.singleton(new Host(aerospikeConfigurationProperties.getHost(), aerospikeConfigurationProperties.getPort()));
  }
  @Override
  protected String nameSpace() {
    return aerospikeConfigurationProperties.getNamespace();
  }
}

主要application是-

import com.aerospike.demo.simplespringbootaerospikedemo.configuration.AerospikeConfiguration;
import com.aerospike.demo.simplespringbootaerospikedemo.objects.User;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.data.aerospike.core.AerospikeTemplate;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;
import java.util.stream.Stream;
import org.joda.time.DateTime;

public class TestSpringConfig {
  public static void main(String[] args) throws IOException {
    System.out.println(ClassLoader.getSystemResourceAsStream("application.properties").available());

    Properties props = new Properties();
    InputStream resourceAsStream =  ClassLoader.getSystemResourceAsStream("application.properties");
    if (resourceAsStream != null) {
      props.load(resourceAsStream);
    }
    if(props != null) {
      System.setProperties(props);
    }
    try {
      ApplicationContext ctx = new AnnotationConfigApplicationContext(AerospikeConfiguration.class);
      AerospikeTemplate template = ctx.getBean(AerospikeTemplate.class);
      template.save(new User(123, "","", 12, DateTime.now().plusSeconds(60).getMillis()));
    } catch (Exception e) {
      StackTraceElement[] st = e.getStackTrace();
      Stream.of(st).forEach(System.out::println);
    } catch (ExceptionInInitializerError e) {
      System.out.println(e.getCause());
      e.getCause().printStackTrace();
    }
  }
}

当我运行主应用程序出现以下错误时 -

java.lang.NullPointerException at java.base/sun.nio.fs.UnixPath.normalizeAndCheck(UnixPath.java:75) at java.base/sun.nio.fs.UnixPath.(UnixPath.java:69) at java.base/sun.nio.fs.UnixFileSystem.getPath(UnixFileSystem.java:279) at java.base/java.io.FilePermission.(FilePermission.java:207) at java.base/sun.security.provider.PolicyFile.getKnownPermission(PolicyFile.java:886) at java.base/sun.security.provider.PolicyFile.getInstance(PolicyFile.java:836) at java.base/sun.security.provider.PolicyFile.addGrantEntry(PolicyFile.java:735) at java.base/sun.security.provider.PolicyFile.initDefaultPolicy(PolicyFile.java:491) at java.base/sun.security.provider.PolicyFile.run(PolicyFile.java:338) at java.base/sun.security.provider.PolicyFile.run(PolicyFile.java:335) at java.base/java.security.AccessController.doPrivileged(Native Method) at java.base/sun.security.provider.PolicyFile.initPolicyFile(PolicyFile.java:335) at java.base/sun.security.provider.PolicyFile.init(PolicyFile.java:328) at java.base/sun.security.provider.PolicyFile.(PolicyFile.java:281) at java.base/java.security.Policy.loadPolicyProvider(Policy.java:207) at java.base/java.security.Policy.getPolicyNoCheck(Policy.java:178) at java.base/java.security.ProtectionDomain.implies(ProtectionDomain.java:321) at java.base/java.security.ProtectionDomain.impliesWithAltFilePerm(ProtectionDomain.java:353) at java.base/java.security.AccessControlContext.checkPermission(AccessControlContext.java:450) at java.base/java.security.AccessController.checkPermission(AccessController.java:897) at ch.qos.logback.core.util.Loader.run(Loader.java:48) at ch.qos.logback.core.util.Loader.run(Loader.java:45) at java.base/java.security.AccessController.doPrivileged(Native Method) at ch.qos.logback.core.util.Loader.(Loader.java:45) at ch.qos.logback.classic.util.ContextInitializer.findURLOfDefaultConfigurationFile(ContextInitializer.java:109) at ch.qos.logback.classic.util.ContextInitializer.autoConfig(ContextInitializer.java:138) at org.slf4j.impl.StaticLoggerBinder.init(StaticLoggerBinder.java:84) at org.slf4j.impl.StaticLoggerBinder.(StaticLoggerBinder.java:55) at org.slf4j.LoggerFactory.bind(LoggerFactory.java:150) at org.slf4j.LoggerFactory.performInitialization(LoggerFactory.java:124) at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:417) at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:362) at org.apache.commons.logging.LogAdapter$Slf4jAdapter.createLocationAwareLog(LogAdapter.java:130) at org.apache.commons.logging.LogAdapter.createLog(LogAdapter.java:91) at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:67) at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:59) at org.springframework.context.support.AbstractApplicationContext.(AbstractApplicationContext.java:178) at org.springframework.context.support.GenericApplicationContext.(GenericApplicationContext.java:112) at org.springframework.context.annotation.AnnotationConfigApplicationContext.(AnnotationConfigApplicationContext.java:67) at org.springframework.context.annotation.AnnotationConfigApplicationContext.(AnnotationConfigApplicationContext.java:91) at com.aerospike.demo.simplespringbootaerospikedemo.TestSpringConfig.main(TestSpringConfig.java:27)

知道如何解决这个错误吗？

Answer 1

您尝试实施以“自动装配”AerospikeTemplate bean 的变通方法不起作用并导致 NPE。有几种方法可以在静态 main() 方法中“自动装配”一个 bean（在本例中是一个 AerospikeTemplate bean），这是一个 Whosebug 问题，它讨论了这种情况：

但主要问题是您要达到什么目的？使用 Spring Data Aerospike Repository/Template 的传统方法是在服务（也是一个 bean）中自动装配 repository/template，然后从 controller/test/different 服务等调用服务方法。 .. 大多数 Spring 应用程序在静态 main() 方法中不包含逻辑 - 它可以完成，但没有多大意义。

Answer 2

要自动装配 AerospikeTemplate，您需要在 main 方法中设置 Spring 引导应用程序（查看示例 here）：

@SpringBootApplication
public class DemoApplication {

public static void main(String[] args) {
    SpringApplication.run(DemoApplication.class, args);
}

}

然后你可以在任何你需要的地方自动装配 AerospikeTemplate。

如果您正在使用 Spring Boot 开发控制台应用程序，我建议您使用 org.springframework.boot.CommandLineRunner。例如：

@Component
public class CommandLineRunnerImpl implements CommandLineRunner {

@Autowired
AerospikeTemplate template;

@Override
public void run(String... args) throws Exception {
    template.save(new User(123, "","", 12, DateTime.now().plusSeconds(60).getMillis()));
}
}

java.lang.NullPointerException 在 java.base/sun.nio.fs.UnixPath.normalizeAndCheck(UnixPath.java:75) 在 SpringApplication

java.lang.NullPointerException at java.base/sun.nio.fs.UnixPath.normalizeAndCheck(UnixPath.java:75) in SpringApplication

slf4j

spring-data

spring-boot

aerospike