小编Soh*_*ham的帖子

我有一个使用spring-boot,jpa-hiberanate与mysql的应用程序.我收到此错误日志

Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: The last packet successfully received from the server was 56,006,037 milliseconds ago.  The last packet sent successfully to the server was 56,006,037 milliseconds ago. is longer than the server configured value of 'wait_timeout'. You should consider either expiring and/or testing connection validity before use in your application, increasing the server configured values for client timeouts, or using the Connector/J connection property 'autoReconnect=true' to avoid this problem.

这是我的application.properties

# DataSource settings: set here configurations for the database …

目前我正在使用java 8最新的android studio 2.1

这是我的build.gradle档案

android {
    compileSdkVersion 22
    buildToolsVersion "24rc3"

    defaultConfig {
        applicationId "com.name"
        minSdkVersion 10
        targetSdkVersion 19
        jackOptions {
            enabled true
        }
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
.......
}

我得到以下编译时错误,我不知道

错误:com.android.jack.frontend.FrontendCompilationException:无法在com.android.jack.Jack.run(Jack.java:472)的com.android.jack.Jack.buildSession(Jack.java:892)编译com.android.jack.api.v01.impl.Api01ConfigImpl $ Api01CompilationTaskImpl.run(Api01ConfigImpl.java:102)... 8更多警告:处理任务java.io.IOException时出现异常:com.android.jack.api.v01 .CompilationException:编译失败:oTT:compileDebugJavaWithJack FAILED错误:任务执行失败':oTT:compileDebugJavaWithJack'.

java.io.IOException:com.android.jack.api.v01.CompilationException:无法编译信息:BUILD FAILED

请您询问是否需要一些细节.

从服务器日志我得到以下错误

    o.s.w.s.m.m.a.HttpEntityMethodProcessor  : 
    Written [{timestamp=Fri May 15 01:39:47 EDT 2015, status=500, error=Internal Server Error, exception=org.springframework.transaction.TransactionSystemException, message=Could not roll back JPA transaction; nested exception is javax.persistence.PersistenceException: 
    unexpected error when rollbacking, 
    path=/api/act}] 
    as "application/json;charset=UTF-8" using [org.springframework.http.converter.json.MappingJackson2HttpMessageConverter@6dc2f5d0]

编辑:

     at com.mysql.jdbc.Util.handleNewInstance(Util.java:377)
        at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1036)
        at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:3661)
        at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2417)
        at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2582)
        at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2526)
        at com.mysql.jdbc.ConnectionImpl.setAutoCommit(ConnectionImpl.java:4846)
        at sun.reflect.GeneratedMethodAccessor45.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:497)
        at org.apache.tomcat.jdbc.pool.ProxyConnection.invoke(ProxyConnection.java:126)
        at org.apache.tomcat.jdbc.pool.JdbcInterceptor.invoke(JdbcInterceptor.java:108)
        at org.apache.tomcat.jdbc.pool.DisposableConnectionFacade.invoke(DisposableConnectionFacade.java:81)
        at com.sun.proxy.$Proxy60.setAutoCommit(Unknown Source)
        at org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.doBegin(JdbcTransaction.java:72)
        at org.hibernate.engine.transaction.spi.AbstractTransactionImpl.begin(AbstractTransactionImpl.java:162)
        at org.hibernate.internal.SessionImpl.beginTransaction(SessionImpl.java:1435)
        at org.hibernate.jpa.internal.TransactionImpl.begin(TransactionImpl.java:61)
        at org.springframework.orm.jpa.vendor.HibernateJpaDialect.beginTransaction(HibernateJpaDialect.java:159)
        at org.springframework.orm.jpa.JpaTransactionManager.doBegin(JpaTransactionManager.java:380)
        at org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:373)
        at …

我试图在相对布局上显示PopupWindow.

 popupWindow.showAtLocation(layout,  Gravity.BOTTOM
            |Gravity.CENTER, 0, layout);

布局是相对布局.但它只出现在底部.不在相对布局上方.我检查过这个.但它没有帮助.

这是我的PopupWindow布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="200dp"
    android:layout_height="wrap_content"
    android:background="@drawable/nearbyplace_bg"
    android:orientation="vertical">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:weightSum="1">


        <TextView
            android:id="@+id/txt_school"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:layout_centerVertical="true"
            android:layout_marginLeft="10dp"
            android:layout_weight="0.8"
            android:text="@string/school"
            android:textSize="17dp" />

        <CheckBox
            android:id="@+id/cb_school"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:layout_alignParentTop="true"
            android:layout_weight="0.2" />
    </LinearLayout>

    <View
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:background="@color/grey" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:weightSum="1">


        <TextView
            android:id="@+id/txt_college"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:layout_centerVertical="true"
            android:layout_marginLeft="10dp"
            android:layout_weight="0.8"
            android:text="@string/college"
            android:textSize="17dp" />

        <CheckBox
            android:id="@+id/cb_college"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:layout_alignParentTop="true"
            android:layout_weight="0.2" />
    </LinearLayout>

    <View
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:background="@color/grey" …

我想使用排球库发布布尔值，双精度数据。我没有得到如何使用它的信息。还有其他过程吗？谢谢。

这是我的方法。

@Override

        protected Map<String, String> getParams() {

            Map<String, String> params = new HashMap<String, String>();
            params.put("name", "name");
            params.put("email", "abc@abc.info");
            params.put("pass", "password");

            return params;
        }

我正在尝试从Create a RabbitMQ消息接收器运行示例项目.但它正在抛出异常

java.lang.IllegalArgumentException: Attribute 'exclude' is of type [Class[]], but [String[]] was expected. Cause: 
    at org.springframework.core.annotation.AnnotationAttributes.doGet(AnnotationAttributes.java:117)
    at org.springframework.core.annotation.AnnotationAttributes.getStringArray(AnnotationAttributes.java:70)
    at org.springframework.boot.autoconfigure.EnableAutoConfigurationImportSelector.selectImports(EnableAutoConfigurationImportSelector.java:63)
    at org.springframework.context.annotation.ConfigurationClassParser.processImport(ConfigurationClassParser.java:386)
    at org.springframework.context.annotation.ConfigurationClassParser.doProcessConfigurationClass(ConfigurationClassParser.java:204)
    at org.springframework.context.annotation.ConfigurationClassParser.processConfigurationClass(ConfigurationClassParser.java:163)
    at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:138)
    at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:284)
    at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:225)
    at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:630)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:461)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:683)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:313)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:944)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:933)
    at Application.main(Application.java:69)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:140)

这是我的pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

        <groupId>org.springframework</groupId>
        <artifactId>gs-messaging-rabbitmq</artifactId>
        <version>0.1.0</version>

        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>1.2.3.RELEASE</version>
        </parent>

        <build>
            <plugins> …

我正在为现有的游戏引擎编写自己的插件（可以说它是与主应用程序相关的第 3 方库）。

所以，我无法访问来源MainActivity。

尽管如此，我必须对主要活动lifecycle事件（onCreate, onDestroy, onPause, onResume, onNewIntent以及一些不重要的其他事件）做出某种反应。

感谢Application.ActivityLifecycleCallbacks，我对其中大多数都没有问题。

onNewIntent()出现问题。我无法找到listener此事件的信息并想象处理它的方法。

有谁知道如何捕获onNewIntent事件（当然，除了覆盖它）？

我正在使用pandas库读取.xlxs文件并提取.xlxs文件。现在我正在尝试创建一个扩展名为.ods的文件，并使用pyexcel_ods库将其写入其中。这是我的代码：--dataframedataframe

import pandas as pd
from pyexcel_ods import save_data
from collections import OrderedDict

self.current_df = pd.read_excel('filename')
data = OrderedDict()
data.update(df)
save_data("as.ods", data)