answer:The error message you're seeing suggests that your application is trying to access a file called "zoneinfo.zip" located in the "C:Golibtime" directory, but it can't find it. This directory structure looks like a Windows file path, which is unusual if you're running your application in a Docker container or Kubernetes pod, as they typically use a Linux file system. Based on the information you've provided, I would guess that your application was built on a Windows machine and is now trying to access files that are not present in the Docker container or Kubernetes pod. To resolve this issue, you have a few options: 1. Rebuild your Docker image on a Linux machine, making sure that all dependencies and build artifacts are available in the container. 2. Modify your application to look for the "zoneinfo.zip" file in a different location, or to use a different mechanism to load time zone information. For example, you could try modifying your application to use the Go standard library's time zone database instead of an external file. 3. If you must use a Windows-based Docker image, try copying the "zoneinfo.zip" file into the container at the appropriate location during the Docker build process. You can do this using a Dockerfile that includes a COPY or ADD command to copy the file from the build context into the container. Without more information about your application and build environment, it's difficult to provide a more specific solution. However, I hope this helps you get started with troubleshooting the problem!,When using Go's time package, specifically the LoadLocation method, it searches for time zone database information in different locations. The documentation for LoadLocation in the time package's source code explains this behavior. The search order is as follows: 1. It checks for a location specified by the ZONEINFO environment variable. 2. It looks for known locations where time zone database files are stored on Unix operating systems. 3. It checks for the zoneinfo.zip file in the GOROOT directory. In your case, since you are running the application in a Docker container, the third option is not available as there is no GOROOT. The optimized container you mentioned may not have the necessary time zone database files, so the second option might not work either. This leaves you with the first option, which involves providing your own time zone database files in the container and referencing their location using the ZONEINFO environment variable. However, this approach can be cumbersome and may fail silently if the requested time zone file does not exist. To simplify this process, you can consider using a package like "knozone", which I created to address this problem. The "knozone" package utilizes the LoadLocationFromTZData method and aims to simplify the handling of your own copy of the time zone database. You can find more information about it in my Stack Overflow question titled "Detect if ZONEINFO fails in Go" (https://stackoverflow.com/questions/51053321/detect-if-zoneinfo-fails-in-go) and the repository for the "knozone" package on GitHub (https://github.com/slotheroo/knozone).,The error message "err: open C:Go/lib/time/zoneinfo.zip: no such file or directory" indicates that Docker is unable to locate the 'zoneinfo.zip' file in the specified directory. This issue often occurs when Docker is trying to run a Go application under a different operating system or environment than it was built in. The Go runtime (specifically, the 'time' package) relies on a file called 'zoneinfo.zip' to provide accurate timezone information. Here's how you can solve your problem: 1. If possible, re-build your application in the target environment (i.e., the same OS that Kubernetes runs on). This should generate the necessary 'zoneinfo.zip' file in the correct location. 2. If re-building your application is not possible or practical, you can manually copy the 'zoneinfo.zip' file to the expected location (C:Golibtime) within your Docker container's filesystem. This can be done using any suitable method for mounting your local filesystem into your Docker container (such as Docker's '-v' option or a Docker volume). Here is a basic example using the 'docker cp' command to copy the file manually: ```bash docker cp zoneinfo.zip <container_name>:C:Golibtime ``` Replace 'container_name' with the appropriate name for your container. This should resolve the error and allow your application to initialize correctly within the Docker container running on Kubernetes Engine.

answer:You can update the default value in your database table using the ALTER TABLE command in MySQL. Here is how you can do it without affecting the existing data: 1. Set the new default value: To update the default value for your specific column to '0000-00-00' in the table, you can use the following SQL query. This command will not change the existing data in your table: ``` ALTER TABLE your_table_name MODIFY COLUMN your_column_name DATE DEFAULT '0000-00-00'; ``` 2. Verify the changes: After you run the ALTER TABLE command, you can verify the changes by selecting the column from the table: ``` SELECT * FROM your_table; ``` This will show the updated column with the new default value. This method allows you to update the default value of a column in MySQL without affecting existing data.,To change the default value of a column in your database table, you can use the ALTER TABLE statement with either the CHANGE or MODIFY keyword. The ALTER TABLE statement allows you to modify the structure of an existing table. Here is an example of the ALTER TABLE statement syntax to change the default value of a column: ```sql ALTER TABLE `tableName` CHANGE `columnName` `columnName` DATE DEFAULT '0000-00-00'; ``` Alternatively, you can use the MODIFY keyword to achieve the same result: ```sql ALTER TABLE `tableName` MODIFY `columnName` DATE DEFAULT '0000-00-00'; ``` Replace `tableName` with the name of your table and `columnName` with the name of the column you want to modify. By executing either of these statements, you will change the default value of the specified column to '0000-00-00'. This means that if no value is provided for the date column during row creation, it will automatically be set to '0000-00-00'. Make sure to replace the `tableName` and `columnName` placeholders with the actual names of your table and column., To change the default value of a column in a database table through the command prompt, you can use the `ALTER TABLE` command. This command allows you to modify the structure of a table in your database. Here is an example of how you can use the `ALTER TABLE` command to change the default value of a column: ``` ALTER TABLE table_name ALTER COLUMN column_name SET DEFAULT '0000-00-00'; ``` Replace `table_name` with the name of your table, and `column_name` with the name of the column whose default value you want to change. This command will only change the default value for new rows that are inserted into the table. It will not affect the existing data in the table. Here's an example of how you can use this command in MySQL: ``` ALTER TABLE my_table ALTER COLUMN my_date_column SET DEFAULT '0000-00-00'; ``` This command will change the default value of the `my_date_column` column in the `my_table` table to '0000-00-00'. I hope this helps! Let me know if you have any other questions.

answer:Yes, it is possible to create a distributable JAR package that contains only the classes from specific packages using the Maven Jar Plugin. You can configure the plugin to include only the required packages and exclude the ones you don't want, such as the mock-up package. Here's an example of how to configure the Maven Jar Plugin in your `pom.xml`: ```xml <build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-jar-plugin</artifactId> <version>3.2.0</version> <executions> <execution> <id>create-main-jar</id> <phase>package</phase> <goals> <goal>jar</goal> </goals> <configuration> <classifier>main</classifier> <includes> <include>com/yourcompany/package1/**</include> <include>com/yourcompany/package2/**</include> </includes> <excludes> <exclude>com/yourcompany/mockup/**</exclude> </excludes> </configuration> </execution> </executions> </plugin> </plugins> </build> ``` Replace `com/yourcompany/package1`, `com/yourcompany/package2`, and `com/yourcompany/mockup` with your actual package names. This configuration creates a JAR file with a `main` classifier containing only the classes from the two required packages. Make sure to update your application's classpath to include this JAR file and its dependencies if you aren't using an executable JAR.,Certainly, it's possible to do this using the Maven Jar Plugin if you have full control over the build process. You can limit the sources of the package by adding a 'clean' profile to exclude the undesired package. Here is a sample configuration: ```xml <project> <modelVersion>4.0.0</modelVersion> ... <build> <sourceDirectory>src/main/java</sourceDirectory> <resources> <resource> <directory>src/main/resources</directory> </resource> </resources> <plugins> <plugin> <artifactId>maven-jar-plugin</artifactId> <version>3.0.2</version> <executions> <execution> <goals> <goal>jar</goal> </goals> </execution> </executions> </plugin> <plugin> <artifactId>maven-clean-plugin</artifactId> <version>3.0.0</version> <configuration> <skip>true</skip> </configuration> <executions> <execution> <id>clean-defaults</id> <phase>clean</phase> <configuration> <filesets> <fileset> <directory>{basedir}/src/main/java/package-to-remove</directory> </fileset> </filesets> </configuration> <goals> <goal>clean</goal> </goals> </execution> </executions> <configuration> <skip>true</skip> </configuration> </plugin> </plugins> </build> ... </project> ``` As you see, a 'clean' profile is added to maven-clean-plugin and configured to remove `src/main/java/package-to-remove`, which matches the path to your unwanted package. The `execution` element inside the `configuration` element ensures that the unwanted package is excluded from the build. ,Yes, it is possible to achieve this using the Maven Jar Plugin. You can configure multiple executions of the plugin in the package phase of your build process and specify different includes and excludes for each execution. This way, you can control which classes are included in each jar package. You can refer to the Maven Jar Plugin documentation for more information on how to configure multiple executions and specify includes/excludes. Specifically, take a look at the section titled "How to create an additional attached jar artifact from the project". If you prefer to use the Assembly plugin, you can create a new assembly descriptor based on the jar-with-dependencies template and add the necessary inclusions/exclusions to customize it according to your requirements.

answer:You can make the `Plugin` trait generic over the `Errors` type, and then specify the concrete `Errors` type when implementing the trait for `MyPlugin`. Here's an updated version of your code with this change: ```rust use thiserror::Error; // ---------------------------------------- // Abstract traits crate trait Thing { type Errors; type Version; fn plugin(&self) -> &Box<dyn Plugin<Errors = Self::Errors, Version = Self::Version>>; fn foo(&self) -> Result<(), Self::Errors>; } trait Plugin<E: Error> { type Version; fn bar(&self) -> Result<(), E>; } // ---------------------------------------- // plugin crate #derive(Error, Debug, PartialEq) enum PluginErrors { #error("First Plugin error") ,In this case, it seems you are trying to make the `Errors` type in the `Plugin` trait generic, which is causing the compile errors you mentioned. However, if you take a closer look at your code, you'll notice that the `MyPlugin` struct is already implementing the `Plugin` trait with a concrete type for `Errors` (`MyThingErrors`), which matches the `Errors` type expected by the `MyThing` implementation of the `Thing` trait. To fix your compile errors, you can make the `Errors` type in the `Plugin` trait generic by replacing `trait Plugin` with `trait Plugin<E: Error>`. Here's how you can modify your code: ```rust // Abstract traits crate trait Thing { type Errors: Error; type Version; fn plugin(&self) -> &Box<dyn Plugin<Errors = Self::Errors, Version = Self::Version>>; fn foo(&self) -> Result<(), Self::Errors>; } trait Plugin<E: Error> { type Version; fn bar(&self) -> Result<(), Self::Errors>; } // plugin crate struct PluginVersion {} struct MyPlugin {} impl Plugin<MyThingErrors> for MyPlugin { type Version = PluginVersion; fn bar(&self) -> Result<(), MyThingErrors> { Err(MyThingErrors::PluginError(PluginErrors::Error1)) } } // concrete implementation crate struct MyThing { p: Box<dyn Plugin<Errors = MyThingErrors, Version = <MyThing as Thing>::Version>>, } impl Thing for MyThing { type Version = PluginVersion; type Errors = MyThingErrors; fn plugin(&self) -> &Box<dyn Plugin<Version = Self::Version, Errors = Self::Errors>> { &self.p } fn foo(&self) -> Result<(), Self::Errors> { Err(MyThingErrors::MTError1) } } ``` With these changes, you can now make the `Errors` type in the `Plugin` trait generic. The rest of your,One way to solve this problem is by providing a way to map error types on the plugins. We can achieve this by adding a `MappedPlugin` type to the traits crate. Here's an example implementation: ```rust struct MappedPlugin<P, F> { p: P, f: F, } impl<P, F, E> Plugin for MappedPlugin<P, F> where P: Plugin, F: Fn(P::Errors) -> E, { type Errors = E; type Version = P::Version; fn bar(&self) -> Result<(), Self::Errors> { self.p.bar().map_err(&self.f) } } ``` With this implementation, you can wrap the created plugin in the main crate like this: ```rust fn main() { let f = |e: PluginErrors| -> MyThingErrors { MyThingErrors::PluginError(e) }; let t = MyThing { p: Box::new(MappedPlugin { p: MyPlugin {}, f: f }), }; if let Err(e1) = t.foo() { assert_eq!(e1, MyThingErrors::MTError1); } if let Err(e2) = t.p.bar() { assert_eq!(e2, MyThingErrors::PluginError(PluginErrors::Error1)); } } ``` You can even create a simple function to handle the wrapping for you, making the code more concise. For example: `MyPlugin{}.map_err(|e| MyThingErrors::PluginError)`. Note that the main crate still needs to know about the error types in the plugin crates. You can find a full working version of the code here(https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=a66ae5d1e329c6b75c974b6fe48e377f).