Created
October 21, 2023 16:44
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JDK 21 String Template Bug
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import java.util.function.*; | |
class JDBC { | |
void transaction(Consumer<ConnectionW> f) { | |
f.accept(new ConnectionW()); | |
} | |
<T> T transaction(Function<ConnectionW, T> f) { | |
return f.apply(new ConnectionW()); | |
} | |
} | |
class ConnectionW { | |
SQL prepare() { | |
return new SQL(); | |
} | |
} | |
class SQL implements StringTemplate.Processor<PreparedStatementW, RuntimeException> { | |
public PreparedStatementW process(StringTemplate template) throws RuntimeException { | |
System.out.println(template.fragments()); | |
return new PreparedStatementW(); | |
} | |
} | |
class PreparedStatementW { | |
void execute() { | |
System.out.println("Here I am!"); | |
} | |
} | |
void main() { | |
var jdbc = new JDBC(); | |
jdbc.transaction(conn -> { | |
var name = "a"; | |
var age = 100; | |
conn.prepare().""" | |
insert into "test_user" ("name", "age") values (\{name}, \{age})""" | |
.execute(); | |
}); | |
} | |
/* | |
> javac --source 21 --enable-preview Bad00Main.java | |
Picked up JAVA_TOOL_OPTIONS: -Duser.language=en | |
Bad00Main.java:36: error: processor type cannot be a raw type: prepare | |
conn.prepare().""" | |
^ | |
Note: Bad00Main.java uses preview features of Java SE 21. | |
Note: Recompile with -Xlint:preview for details. | |
1 error | |
*/ |
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import java.util.function.*; | |
class JDBC { | |
void transaction(Consumer<ConnectionW> f) { | |
f.accept(new ConnectionW()); | |
} | |
<T> T transaction(Function<ConnectionW, T> f) { | |
return f.apply(new ConnectionW()); | |
} | |
} | |
class ConnectionW { | |
SQL prepare() { | |
return new SQL(); | |
} | |
} | |
class SQL implements StringTemplate.Processor<PreparedStatementW, RuntimeException> { | |
public PreparedStatementW process(StringTemplate template) throws RuntimeException { | |
System.out.println(template.fragments()); | |
return new PreparedStatementW(); | |
} | |
} | |
class PreparedStatementW { | |
void execute() { | |
System.out.println("Here I am!"); | |
} | |
} | |
void main() { | |
var jdbc = new JDBC(); | |
jdbc.transaction(conn -> { | |
var name = "a"; | |
var age = 100; | |
var sql = conn.prepare(); | |
sql.""" | |
insert into "test_user" ("name", "age") values (\{name}, \{age})""" | |
.execute(); | |
}); | |
} | |
/* | |
> javac --source 21 --enable-preview Bad05Main.java | |
Picked up JAVA_TOOL_OPTIONS: -Duser.language=en | |
Bad05Main.java:37: error: processor type cannot be a raw type: prepare | |
sql.""" | |
^ | |
Note: Bad05Main.java uses preview features of Java SE 21. | |
Note: Recompile with -Xlint:preview for details. | |
1 error | |
*/ |
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> java -version | |
Picked up JAVA_TOOL_OPTIONS: -Duser.language=en | |
openjdk version "21.0.1" 2023-10-17 | |
OpenJDK Runtime Environment (build 21.0.1+12-29) | |
OpenJDK 64-Bit Server VM (build 21.0.1+12-29, mixed mode, sharing) | |
> javac -version | |
Picked up JAVA_TOOL_OPTIONS: -Duser.language=en | |
javac 21.0.1 |
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import java.util.function.*; | |
class JDBC { | |
void transaction(Consumer<ConnectionW> f) { | |
f.accept(new ConnectionW()); | |
} | |
/* | |
* <T> T transaction(Function<ConnectionW, T> f) { | |
* return f.apply(new ConnectionW()); | |
* } | |
*/ | |
} | |
class ConnectionW { | |
SQL prepare() { | |
return new SQL(); | |
} | |
} | |
class SQL implements StringTemplate.Processor<PreparedStatementW, RuntimeException> { | |
public PreparedStatementW process(StringTemplate template) throws RuntimeException { | |
System.out.println(template.fragments()); | |
return new PreparedStatementW(); | |
} | |
} | |
class PreparedStatementW { | |
void execute() { | |
System.out.println("Here I am!"); | |
} | |
} | |
void main() { | |
var jdbc = new JDBC(); | |
jdbc.transaction(conn -> { | |
var name = "a"; | |
var age = 100; | |
conn.prepare().""" | |
insert into "test_user" ("name", "age") values (\{name}, \{age})""" | |
.execute(); | |
}); | |
} |
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import java.util.function.*; | |
class JDBC { | |
void transaction(Consumer<ConnectionW> f) { | |
f.accept(new ConnectionW()); | |
} | |
<T> T transaction(Function<ConnectionW, T> f) { | |
return f.apply(new ConnectionW()); | |
} | |
} | |
class ConnectionW { | |
SQL prepare() { | |
return new SQL(); | |
} | |
} | |
class SQL implements StringTemplate.Processor<PreparedStatementW, RuntimeException> { | |
public PreparedStatementW process(StringTemplate template) throws RuntimeException { | |
System.out.println(template.fragments()); | |
return new PreparedStatementW(); | |
} | |
} | |
class PreparedStatementW { | |
void execute() { | |
System.out.println("Here I am!"); | |
} | |
} | |
void main() { | |
var jdbc = new JDBC(); | |
jdbc.transaction((ConnectionW conn) -> { | |
var name = "a"; | |
var age = 100; | |
conn.prepare().""" | |
insert into "test_user" ("name", "age") values (\{name}, \{age})""" | |
.execute(); | |
}); | |
} |
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import java.util.function.*; | |
class JDBC { | |
void transaction(Consumer<ConnectionW> f) { | |
f.accept(new ConnectionW()); | |
} | |
<T> T transaction(Function<ConnectionW, T> f) { | |
return f.apply(new ConnectionW()); | |
} | |
} | |
class ConnectionW { | |
SQL prepare() { | |
return new SQL(); | |
} | |
} | |
class SQL implements StringTemplate.Processor<PreparedStatementW, RuntimeException> { | |
public PreparedStatementW process(StringTemplate template) throws RuntimeException { | |
System.out.println(template.fragments()); | |
return new PreparedStatementW(); | |
} | |
} | |
class PreparedStatementW { | |
void execute() { | |
System.out.println("Here I am!"); | |
} | |
} | |
void main() { | |
var jdbc = new JDBC(); | |
jdbc.transaction((Consumer<ConnectionW>) conn -> { | |
var name = "a"; | |
var age = 100; | |
conn.prepare().""" | |
insert into "test_user" ("name", "age") values (\{name}, \{age})""" | |
.execute(); | |
}); | |
} |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
import java.util.function.*; | |
class JDBC { | |
void transaction(Consumer<ConnectionW> f) { | |
f.accept(new ConnectionW()); | |
} | |
<T> T transaction(Function<ConnectionW, T> f) { | |
return f.apply(new ConnectionW()); | |
} | |
} | |
class ConnectionW { | |
SQL prepare() { | |
return new SQL(); | |
} | |
} | |
class SQL implements StringTemplate.Processor<PreparedStatementW, RuntimeException> { | |
public PreparedStatementW process(StringTemplate template) throws RuntimeException { | |
System.out.println(template.fragments()); | |
return new PreparedStatementW(); | |
} | |
} | |
class PreparedStatementW { | |
void execute() { | |
System.out.println("Here I am!"); | |
} | |
} | |
void main() { | |
var jdbc = new JDBC(); | |
jdbc.transaction(conn -> { | |
var name = "a"; | |
var age = 100; | |
SQL sql = conn.prepare(); | |
sql.""" | |
insert into "test_user" ("name", "age") values (\{name}, \{age})""" | |
.execute(); | |
}); | |
} |
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