LOGGER::info is not consumed as s -> LOGGER.info(s)

I have defined a logger instance as follows:

private static final Logger LOGGER = Logger.getLogger(Main.class.getName());

I have an array of strings that I want to log, so I used the following:

Arrays.stream(new String{"ABC", "DEF", "XYZ"}).forEach(LOGGER::info);

However, nothing is printed into the log. But, if I change the reference method to an equivalent lambda form, it prints into the log:

Arrays.stream(new String{"ABC", "DEF", "XYZ"}).forEach(s -> LOGGER.info(s));

What am I missing here?

I tried the following approaches as well and they all behave the same:

Stream.of("ABC", "DEF", "XYZ").forEach(LOGGER::info);

List.of("ABC", "DEF", "XYZ").forEach(LOGGER::info);

Even Intellij IDE highlights s -> LOGGER.info(s) with yellow and suggests changing it to LOGGER::info.

I tried to define a custom class:

static class Consumer

{

    void consume(String s)

    {

        LOGGER.info(s);

    }

}

and use it in place of LOGGER::info:

Consumer consumer = new Consumer();

Arrays.stream(new String{"ABC", "DEF", "XYZ"}).forEach(consumer::consume);

It prints into the log!

The Logger class has two overloaded methods:

void info(String msg)

and

void info(Supplier<String> msgSupplier)

but only the first is assignable to void forEach(Consumer<? super T> action), I believe.

edited Nov 14 '18 at 13:50

asked Nov 14 '18 at 13:39

Eng.Fouad

84.9k53248362

Interesting... it's working for me well. What version of java did you use?

– Aleksandr Semyannikov
Nov 14 '18 at 13:51

I tried it on both Java 8 and Java 11. Currently, I am using Oracle JDK 11.0.1.

– Eng.Fouad
Nov 14 '18 at 13:52

Works for me on java 8u191

– Julio Daniel Reyes
Nov 14 '18 at 13:54

Arrays.stream(new String { "ABC", "DEF", "XYZ" }).forEach(LOGGER::info); works fine for me (Java 8), LOGGER being a java.util.logging.Logger.

– Alex Shesterov
Nov 14 '18 at 13:54

add a comment |

I have defined a logger instance as follows:

private static final Logger LOGGER = Logger.getLogger(Main.class.getName());

I have an array of strings that I want to log, so I used the following:

Arrays.stream(new String{"ABC", "DEF", "XYZ"}).forEach(LOGGER::info);

However, nothing is printed into the log. But, if I change the reference method to an equivalent lambda form, it prints into the log:

Arrays.stream(new String{"ABC", "DEF", "XYZ"}).forEach(s -> LOGGER.info(s));

What am I missing here?

I tried the following approaches as well and they all behave the same:

Stream.of("ABC", "DEF", "XYZ").forEach(LOGGER::info);

List.of("ABC", "DEF", "XYZ").forEach(LOGGER::info);

Even Intellij IDE highlights s -> LOGGER.info(s) with yellow and suggests changing it to LOGGER::info.

I tried to define a custom class:

static class Consumer

{

    void consume(String s)

    {

        LOGGER.info(s);

    }

}

and use it in place of LOGGER::info:

Consumer consumer = new Consumer();

Arrays.stream(new String{"ABC", "DEF", "XYZ"}).forEach(consumer::consume);

It prints into the log!

The Logger class has two overloaded methods:

void info(String msg)

and

void info(Supplier<String> msgSupplier)

but only the first is assignable to void forEach(Consumer<? super T> action), I believe.

edited Nov 14 '18 at 13:50

asked Nov 14 '18 at 13:39

Eng.Fouad

84.9k53248362

Interesting... it's working for me well. What version of java did you use?

– Aleksandr Semyannikov
Nov 14 '18 at 13:51

I tried it on both Java 8 and Java 11. Currently, I am using Oracle JDK 11.0.1.

– Eng.Fouad
Nov 14 '18 at 13:52

Works for me on java 8u191

– Julio Daniel Reyes
Nov 14 '18 at 13:54

Arrays.stream(new String { "ABC", "DEF", "XYZ" }).forEach(LOGGER::info); works fine for me (Java 8), LOGGER being a java.util.logging.Logger.

– Alex Shesterov
Nov 14 '18 at 13:54

add a comment |

I have defined a logger instance as follows:

private static final Logger LOGGER = Logger.getLogger(Main.class.getName());

I have an array of strings that I want to log, so I used the following:

Arrays.stream(new String{"ABC", "DEF", "XYZ"}).forEach(LOGGER::info);

However, nothing is printed into the log. But, if I change the reference method to an equivalent lambda form, it prints into the log:

Arrays.stream(new String{"ABC", "DEF", "XYZ"}).forEach(s -> LOGGER.info(s));

What am I missing here?

I tried the following approaches as well and they all behave the same:

Stream.of("ABC", "DEF", "XYZ").forEach(LOGGER::info);

List.of("ABC", "DEF", "XYZ").forEach(LOGGER::info);

Even Intellij IDE highlights s -> LOGGER.info(s) with yellow and suggests changing it to LOGGER::info.

I tried to define a custom class:

static class Consumer

{

    void consume(String s)

    {

        LOGGER.info(s);

    }

}

and use it in place of LOGGER::info:

Consumer consumer = new Consumer();

Arrays.stream(new String{"ABC", "DEF", "XYZ"}).forEach(consumer::consume);

It prints into the log!

The Logger class has two overloaded methods:

void info(String msg)

and

void info(Supplier<String> msgSupplier)

but only the first is assignable to void forEach(Consumer<? super T> action), I believe.

edited Nov 14 '18 at 13:50

asked Nov 14 '18 at 13:39

Eng.Fouad

84.9k53248362

I have defined a logger instance as follows:

private static final Logger LOGGER = Logger.getLogger(Main.class.getName());

I have an array of strings that I want to log, so I used the following:

Arrays.stream(new String{"ABC", "DEF", "XYZ"}).forEach(LOGGER::info);

However, nothing is printed into the log. But, if I change the reference method to an equivalent lambda form, it prints into the log:

Arrays.stream(new String{"ABC", "DEF", "XYZ"}).forEach(s -> LOGGER.info(s));

What am I missing here?

I tried the following approaches as well and they all behave the same:

Stream.of("ABC", "DEF", "XYZ").forEach(LOGGER::info);

List.of("ABC", "DEF", "XYZ").forEach(LOGGER::info);

Even Intellij IDE highlights s -> LOGGER.info(s) with yellow and suggests changing it to LOGGER::info.

I tried to define a custom class:

static class Consumer

{

    void consume(String s)

    {

        LOGGER.info(s);

    }

}

and use it in place of LOGGER::info:

Consumer consumer = new Consumer();

Arrays.stream(new String{"ABC", "DEF", "XYZ"}).forEach(consumer::consume);

It prints into the log!

The Logger class has two overloaded methods:

void info(String msg)

and

void info(Supplier<String> msgSupplier)

but only the first is assignable to void forEach(Consumer<? super T> action), I believe.

java logging lambda java-stream method-reference

edited Nov 14 '18 at 13:50

asked Nov 14 '18 at 13:39

Eng.Fouad

84.9k53248362

edited Nov 14 '18 at 13:50

asked Nov 14 '18 at 13:39

Eng.Fouad

84.9k53248362

edited Nov 14 '18 at 13:50

asked Nov 14 '18 at 13:39

Eng.Fouad

84.9k53248362

asked Nov 14 '18 at 13:39

Eng.Fouad

84.9k53248362

asked Nov 14 '18 at 13:39

Eng.Fouad

84.9k53248362

Interesting... it's working for me well. What version of java did you use?

– Aleksandr Semyannikov
Nov 14 '18 at 13:51

I tried it on both Java 8 and Java 11. Currently, I am using Oracle JDK 11.0.1.

– Eng.Fouad
Nov 14 '18 at 13:52

Works for me on java 8u191

– Julio Daniel Reyes
Nov 14 '18 at 13:54

Arrays.stream(new String { "ABC", "DEF", "XYZ" }).forEach(LOGGER::info); works fine for me (Java 8), LOGGER being a java.util.logging.Logger.

– Alex Shesterov
Nov 14 '18 at 13:54

add a comment |

Interesting... it's working for me well. What version of java did you use?

– Aleksandr Semyannikov
Nov 14 '18 at 13:51

I tried it on both Java 8 and Java 11. Currently, I am using Oracle JDK 11.0.1.

– Eng.Fouad
Nov 14 '18 at 13:52

Works for me on java 8u191

– Julio Daniel Reyes
Nov 14 '18 at 13:54

Arrays.stream(new String { "ABC", "DEF", "XYZ" }).forEach(LOGGER::info); works fine for me (Java 8), LOGGER being a java.util.logging.Logger.

– Alex Shesterov
Nov 14 '18 at 13:54

Interesting... it's working for me well. What version of java did you use?

– Aleksandr Semyannikov
Nov 14 '18 at 13:51

I tried it on both Java 8 and Java 11. Currently, I am using Oracle JDK 11.0.1.

– Eng.Fouad
Nov 14 '18 at 13:52

Works for me on java 8u191

– Julio Daniel Reyes
Nov 14 '18 at 13:54

Arrays.stream(new String { "ABC", "DEF", "XYZ" }).forEach(LOGGER::info); works fine for me (Java 8), LOGGER being a java.util.logging.Logger.

– Alex Shesterov
Nov 14 '18 at 13:54

add a comment |

1 Answer
1

active

oldest

votes

Consider that code:

Arrays.stream(new String{"ABC"}).forEach(LOGGER::info);

Arrays.stream(new String{"ABC"}).forEach(s -> LOGGER.info(s));

The difference is in the first case source of message is:

java.util.Spliterators$ArraySpliterator

in the second:

Main

Probably your logger has some filter that does not let logging events from java.util.Spliterators$ArraySpliterator class.

Try to check result of LOGGER.getFilter()

edited Nov 18 '18 at 18:21

answered Nov 14 '18 at 14:09

Aleksandr Semyannikov

591216

You got it right. I have a filter that prevents any logging other than from my own packages. Thanks.

– Eng.Fouad
Nov 14 '18 at 14:13

@Eng.Fouad glad to help!

– Aleksandr Semyannikov
Nov 14 '18 at 14:14

add a comment |

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1 Answer
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active

oldest

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1 Answer
1

active

oldest

votes

Consider that code:

Arrays.stream(new String{"ABC"}).forEach(LOGGER::info);

Arrays.stream(new String{"ABC"}).forEach(s -> LOGGER.info(s));

The difference is in the first case source of message is:

java.util.Spliterators$ArraySpliterator

in the second:

Main

Probably your logger has some filter that does not let logging events from java.util.Spliterators$ArraySpliterator class.

Try to check result of LOGGER.getFilter()

edited Nov 18 '18 at 18:21

answered Nov 14 '18 at 14:09

Aleksandr Semyannikov

591216

You got it right. I have a filter that prevents any logging other than from my own packages. Thanks.

– Eng.Fouad
Nov 14 '18 at 14:13

@Eng.Fouad glad to help!

– Aleksandr Semyannikov
Nov 14 '18 at 14:14

add a comment |

Consider that code:

Arrays.stream(new String{"ABC"}).forEach(LOGGER::info);

Arrays.stream(new String{"ABC"}).forEach(s -> LOGGER.info(s));

The difference is in the first case source of message is:

java.util.Spliterators$ArraySpliterator

in the second:

Main

Probably your logger has some filter that does not let logging events from java.util.Spliterators$ArraySpliterator class.

Try to check result of LOGGER.getFilter()

edited Nov 18 '18 at 18:21

answered Nov 14 '18 at 14:09

Aleksandr Semyannikov

591216

You got it right. I have a filter that prevents any logging other than from my own packages. Thanks.

– Eng.Fouad
Nov 14 '18 at 14:13

@Eng.Fouad glad to help!

– Aleksandr Semyannikov
Nov 14 '18 at 14:14

add a comment |

Consider that code:

Arrays.stream(new String{"ABC"}).forEach(LOGGER::info);

Arrays.stream(new String{"ABC"}).forEach(s -> LOGGER.info(s));

The difference is in the first case source of message is:

java.util.Spliterators$ArraySpliterator

in the second:

Main

Probably your logger has some filter that does not let logging events from java.util.Spliterators$ArraySpliterator class.

Try to check result of LOGGER.getFilter()

edited Nov 18 '18 at 18:21

answered Nov 14 '18 at 14:09

Aleksandr Semyannikov

591216

Consider that code:

Arrays.stream(new String{"ABC"}).forEach(LOGGER::info);

Arrays.stream(new String{"ABC"}).forEach(s -> LOGGER.info(s));

The difference is in the first case source of message is:

java.util.Spliterators$ArraySpliterator

in the second:

Main

Probably your logger has some filter that does not let logging events from java.util.Spliterators$ArraySpliterator class.

Try to check result of LOGGER.getFilter()

edited Nov 18 '18 at 18:21

answered Nov 14 '18 at 14:09

Aleksandr Semyannikov

591216

edited Nov 18 '18 at 18:21

answered Nov 14 '18 at 14:09

Aleksandr Semyannikov

591216

answered Nov 14 '18 at 14:09

Aleksandr Semyannikov

591216

answered Nov 14 '18 at 14:09

Aleksandr Semyannikov

591216

You got it right. I have a filter that prevents any logging other than from my own packages. Thanks.

– Eng.Fouad
Nov 14 '18 at 14:13

@Eng.Fouad glad to help!

– Aleksandr Semyannikov
Nov 14 '18 at 14:14

add a comment |

You got it right. I have a filter that prevents any logging other than from my own packages. Thanks.

– Eng.Fouad
Nov 14 '18 at 14:13

@Eng.Fouad glad to help!

– Aleksandr Semyannikov
Nov 14 '18 at 14:14

You got it right. I have a filter that prevents any logging other than from my own packages. Thanks.

– Eng.Fouad
Nov 14 '18 at 14:13

@Eng.Fouad glad to help!

– Aleksandr Semyannikov
Nov 14 '18 at 14:14

add a comment |

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